Article Time

Everyone has dust mites in their beds, which can trigger allergic reactions because of the droppings these tiny insects leave behind. These insects are so tiny that you cannot see them with the naked eye. They do not bite and do not cause any diseases on their own. They thrive in the warm humid environment that a bed mattress provides as well as in carpeting, stuffed toys and in the cushions of the sofa. You can control the dust mite population in your home with regular cleaning and by using dust mite spray.

This product contains boron, which has proven effective in the control of insects in the home. It is a powder that you mix with water in a spray bottle. You spray your home and then repeat the task every four months. It will not harm fabrics and is clear and odourless so it won’t cause any allergic reactions to the residents of the home. You can spray the carpeting, the upholstery, stuffed toys as well as the mattresses and bedding.

If you feel that you really want to make sure you do have dust mites present in your home, you can use a kit that will detect the presence of these insects within ten minutes. These kits are sold individually and one kit will test one surface only. Just testing one mattress in your home may be more than you need to realize that this could be a thriving environment for millions of mites. Although you should wash your bedding in hot water at least once every two weeks and regularly clean and vacuum the floors, you can make this task easier when you use a spray for dust mites.

You can also use the solution of the spray in a carpet cleaner so that you not only kill the mites with the cleaning. The moisture you put into the carpets can lead to dust mites making their home there before it even dries, so you do give yourself additional protection by using the spray solution along with the cleaning.

The way in which this product works is that it coats the source of food for the mites. Mites feed on the dead skin cells of humans and the dander left behind by pets. When you eliminate the food source, then you eliminate the mites. If you perform a test on one surface and use this spray solution, you will see a dramatic decrease in the dust mite population if you retest the same surface after two weeks. After eight weeks, there will be no dust mites remaining.

One 8-ounce bag of the powder for the spray is sufficient for 200 square feet of carpeting. A two ound bag is enough to spray 800 square feet, but this will be reduced if you do use the solution in a carpet cleaner. You should use this product twice a year and when you start to spray your home with it, always start with the bedroom because this is where you will find the most dust mites.

For more information on dust mite spray, bed mites and how to kill dust mites, visit http://www.Dust-Mites.org

You may not realize it, but you do have dust mites in your home. This can lead to all kinds of allergies and medical problems, especially if a member of your family has asthma. Dusting the furniture on a regular basis is not enough on its own to get rid of these pests and you need to look at ways in which you can learn how to kill dust mites.

The bedroom is one area of the home that provides the optimum environment for dust mites to breed and thrive. You need to wash your bedclothes in very hot water on a regular basis at least every two weeks. The water should be at the hottest setting on the washing machine at least 130. If you have fabrics that cannot be washed in hot water, such as some comforters and bedspreads, place them in the freezer for one to two days. Both really hot and really cold temperatures will kill dust mites.

Another method you can use to get rid of dust mites is to replace the bedding with those made from synthetic materials. Instead of using pillows stuffed with feathers and down, use ones that have synthetic fillings. Instead of using woollen blankest, use nylon or cotton ones. The stuffed toys you have in the childrens bedrooms are also havens for dust mites and these need to be washed on a regular basis too. If you are afraid that you may ruin them by washing them in hot water, freeze them once in a while.

Since dust mites thrive in humid conditions, a dehumidifier in your home can help to reduce the humidity levels and so kill the dust mites that exist in the air. Humidity levels should be kept below 50% in order to be effective in this regard. You should also keep the thermostat set below 70 to help kill the mites.

While most people like to make their bed as soon as they rise in the morning, leaving the bed unmade with the sheets exposed to the air for a few hours will help kill the dust mites that live there. This allows the sheets to dry out and while it will not kill all the dust mites it will drastically reduce their numbers.

Carpets and rugs also contain dust mites that you can kill by vacuuming every few days. If it is possible you should vacuum every day. For hardwood and laminate flooring, using a damp mop will control the dust and get rid of the mites. Sweeping a floor scatters the dust throughout the air and this makes the mites airborn. Experts recommend that in order to effectively control the dust mite population in your home, you should remove all carpets.

The sofa is another location often overlooked when you try to kill all the dust mites. By vacuuming the cushions and pillows you will kill the dust mites. Air purifiers are also effective with the filters that remove the dust from the air. You should also replace the filters on your furnace at least every three months.

For more information on how to kill dust mites, dust mite spray and bed mites, visit http://www.Dust-Mites.org

Oleg Systems Co. produces various types of industrial dust collection systems. Dust collecting equipment is available in numerous designs utilizing a number of principles and featuring wide variation in effectiveness, initial cost, operating and maintenance expense, space, arrangements and material of construction.

One of the most widely used type of dust collector is Fabric Dust Collector.

Fabric arresters are high efficiency, medium cost collectors. The effectiveness of passing air or gas through a fabric at low velocity has been recofnized and used for many years in air cleaning devices. Fabric is arranged in envelope or tubular (stocking) shapes. While removal appears to take place by a staining action of the media, in reality dust collection is obtained by building up a mat of the material on the dirty side of the media. This mat provides the actual filtering or straining bed. By means of this bed a high degree of removal is obtained even on sub-micron size particles.

The dust collectors are used extensively in industry for a wide range of applications. They require more space than most other types of air cleaning devices, necessiating outdoor installation in most cases.

Some spesific types of Fabric Dust Collectors engineered by Oleg Systems Co. are:

INTERMITTENT DUTY FABRIC DUST COLLECTORS

These types may use either envelope or stocking arrangement of the fabric but will generally employ shaking or vibrating as a means of reconditioning. Periodically Uusually at 4 to 6 hour intervals the air flow must be stopped to effect reconditioning – thus the classification “intermittent”.

Rate of flow through the media seldom exceeds 4 fpm and often as low as 2 fpm. Ratings are usually selected so pressure drop will be in the 2″ – 5″ WG range between the beginning and the end of a cycle.

As dust accumulates on the media. resistance to flow increases and air flow decreases until the fan is stopped and the media reconditioned. Variation in air flow due to changing pressure losses is sometimes a disadvantage and when coupled with requirement to periodically stop flow may preclude use of intermittent dust collectors.

MULTIPLE-SECTION, CONTINUOUS DUTY, AUTOMATIC FABRIC DUST COLLECTORS

The disadvanteges of stopping the air flow to permit vibration and variations in the airflow can be overcomed by using of sectional arresters allowing continuous operation of the exhaust system as automatic dampers periodically take one section out of service for reconditioning the fabric while the remaining sections take the entire gas volume. The large the number of sections, the nearer the pressure loss will remain constant. The use of reverse air flow to increase effectiveness of removing adhering material is sometimes incorporated in such designs. Reverse-flow collapse type and occasionally reverse-jet type dust collectors utilize the multiple-section principle.

When employing shakers as a means of reconditioning, rate of flow through the media (air to cloth ratio) will range from 2 to 4 fpm as with intermittent type dust collector. Generally this air to cloth ratio is based on net cloth area available when one compartment is out of service for reconditioning.

REVERSE-JET, CONTINUOUS-DUTY, FABRIC COLLECTORS

The reverse-jet type differs from the conventional arrEsters in its use of high pressure air to clean the fabric. One type uses high pressure air (30″ – 40″ WG) from a travelling “blow ring” to dislodge the collected cake from inside the fabric tube. Since dust laden air enters the top of the fabric tube, air flow within the stocking is downward to the hopper allowing the fabric to be cleaned without stopping air flow. Multiple sections or comartmentation is not required for continuous duty. The”blow ring” is normally operated continuously.

Another type uses high pressure compressed air (100 PSI) to break the dust cake from the exterior of the fabric tube or envelope by the intermittent application of reverse-jet compressed air. In some dust collectors of this type multiple sections are utilized. Other dust collectors apply the compressed air on only one or very few tubes or envelopes at a time prventing air flow in adjacent tubes or envelopes and decreasign the possibility of re-entrimane and redeposition.

Cleaning or reconditioning by the reverse-jet method is more complete than that obtained by vibrating or shaking. Higher air flows are possible due to short reconditioning cycle. Air flow rates of 6 to 12 fpm are usual. Pressure loss will be more nearly uniform (generally 4″ to 6″ WG if properly rated) and exhaust air volume will be more nearly constant. Fabric dust collectors of this type might be more expensive and require added maintenance for the cleaning mechanism.

REVERSE-FLOW COLLAPSE, CONTINUOUS DUTY DUST COLLECTORS

Reverse-flow collapse cleaning is generally used with glass media which is fragile and requires a gentle cleaning technique. Reversing the glass flow provides a gentle collapse of the fabric usually in a “four point star” braking the dust cake which falls by gravity into the hopper.

For additional information please refer to http://www.olegsystems.com/dustcollector/Index.html.

Oleg Chetchel
Industrial Process Designer
Oleg Systems Co.
http://www.olegsystems.com/scrubber/Index.html
http://www.olegsystems.com/fan/Index.html

Oleg Systems Co. is a designer and engineering company for industrial dust collectors and dust collection systems. Dust collecting equipment is available in numerous designs utilizing a number of principles and featuring wide variation in effectiveness, initial cost, operating and maintenance expense, space, arrangements and material of construction.

The dust collectors are used extensively in industry for a wide range of applications. They require more space than most other types of air cleaning devices, necessiating outdoor installation in most cases. One of the most widely used type of dust collector is Fabric Dust Collector.

Fabric arresters are high efficiency, medium cost collectors. The effectiveness of passing air or gas through a fabric at low velocity has been recofnized and used for many years in air cleaning devices. Fabric is arranged in envelope or tubular (stocking) shapes. While removal appears to take place by a staining action of the media, in reality dust collection is obtained by building up a mat of the material on the dirty side of the media. This mat provides the actual filtering or straining bed. By means of this bed a high degree of removal is obtained even on sub-micron size particles.

As dust is collected on the fabric, resistance to air flow increases. Periodically the fabric must be reconditioned by shaking, vibrating, reverse jet or reverse-flow collapse which agitates suffitiently to remove the bulk of adhering material allowing it to drop into the dust hopper. In most collectors air flow must be stopped during reconditioning, otherwise released material will be re-entrained and redeposited on the fabric. Sufficient dust must adhere to the fabric to maintain the dust mat needed for maximum efficiency; therfore, after reconditioning the pressure drop will be considerably higher than loss through new fabric. Periodical cleaning of filter media is one of the most important tasks in the dust collector design. Reverse flow cleaning is generally choosen when the volumetric flow of gases is very large.

This method of cleaning inherently requires a compartment design beacause the reverse flow needed to collapse bags entrains dust that must be returned to on-line compartments of the fabric filrh compartment is equipped with one main shut-off valve and one reverse gas valve, whether the system is blown-through or drawn-through. A secondary blower and duct system is required to reverse the gas flow in the compartment to bcleaned. When a compartment is isolated for cleaning, the reverse gas circuit incrases the volumetric flow and dust loading through the collector`s active compartments.

The fabric medium is reconditioned by reversing the direction of flow through the bags, which partially collapse. After cleaning, the reproduction of gas is dislodged dust to fall into the hopper.

Reverse flow cleaning reduces the number of moving parts in the fabric filter system – a maintenance advantage, especially when large volumetric flows are cleaned. However, the cleaning or reconditioning is less vigorous than other methods, and the risidual drag of the reconditioned fabric is higher. Reverse flow cleaning of dust collectors is particularly suited for fabrics like glass cloth, that require gentle cleaning. Reverse flow dust collecting bags are usually 8 to 12 inches in diameter and 22 to 33 feet long and are generally operated at low velocities in the 2 to 4 fpm range. As a consequence, reverse air dust collectros tend to be substantially larger than pulse jet dust collector designs of similar capacity.

For ambien air applications, a wooven cotton of polypropylene fabric is the usual selection for reverse flow cleaning. For higher temperatures, wooven polyester, glass fiber, or trademarked fabrics are often used. In recent years glass cloth has come into wide use because of silicone treatment of the glass fibers and employment of reverse flow techniques for cleaning. Silicone treatment provides a lubricant between fibers and increases fabric life.

Reverse flow dust collectors are limited to air conditions dry enough to prevent condensation or free moisture deposition on the fabric. With hygroscoping materials, there will be a bonding tendency between particles and fabric under high relative humidity even though no condensation takes place. Maximum recommended temperature for cotton fabric is 180 F, for wool 200 F. Higher temperatures can be handled by using synthetic materials including nylon or orlon fabrics as well as glass cloth and, occasionally, fine metallic mesh. The synthetic fabrics mau be used up to 300 F while glass cloth is acceptable to 550 F.

Rate of flow through the media varies with dust collector type, application and dust concentration. Ratings are usually selected so pressure drop will not exceed 5″ WG. The smaller the particle, the more rapid the resistance rise for a given loading. For the same air flow rate and dust loading, resistance rise increases directly in proportion to time.

For additional information please refer to http://www.olegsystems.com/dustcollector/Index.html.

Oleg Chetchel
Process Air Systems Designer and Engineer
Oleg Systems Co.
http://www.olegsystems.com/fumeextractor/Index.html
http://www.olegsystems.com/aircurtain/Index.html

Oleg Systems Co. produces different kinds of industrial wet scrubbers for air cleaning. Wet type dust collectors / air scrubbers are available in numerous designs utilizing a number of principles and featuring wide variation in effectiveness, initial cost, operating and maintenance expense, space, arrangements and material of construction.

Wet type dust collectors are liquid (usually, but not necessarily, water) to capture and separate particulate matter (dust, mist, and fumes) from a gas stream. Some scrubbers operate by spraying the scrubbing liquid into the contaminated air. Others bubble air through the scrubbing liquid. In addition, many gybrid wet scrubbing designs exist.

Particle sizes, which can be controlled by a wet scrubber, range from 0.3 to 50 microns or a bit larger. Wet collectors may be used for the collection of most particulates from industrial process gas streams where economics allow for collection of the material in a wet state.

Advantage of wet collectors over dry type dust collectors include:

* Constant operating pressure;
* No secondary dust sources;
* Little spare parts requirements, low maintenance in operation;
* Ability to collect both gases and solid / liquid particulates;
* Ability to handle high temperature and high humidity gas streams, as well as to reduce the possibility of fire or explosion;
* Reasonably small space requirements for this type air scrubbers;
* Possibility to continuously collect sticky and hygroscopic solids without becoming fouled.

The mechanisma involved in the capture and removal of pariculars in scrubbers are inertial impact, Brownian diffusion, and condensation:

1) Inertial Impaction occurs when a dust particle and a liquid droplet collide, resulting in the capture of the particle. The resulting liquid/gas particle is relatively large and may be easily removed from the carrying gas stream by gravitational force or impingement on separators.
2) Brownian Diffusion happens when the dust particles are extremely small and have motion independent of the carrier gas stream. These small particles collide with one another, making larger particles, or collide with a liquid droplet and are captured.
3) Condensation occurs when the gas or air is cooled below its dew point. When moisture is condensed from the gas stream, fogging occurs, and the dust particles serve as condensation nuclei. The dust particles become larger as a result of the condensed liquid, and the pobability of their removal by impaction is increased.

Wet scrubbers perform two individual operations. The first one happens in the contact zone, where the dirty gas comes in contact with liquid; the second is the separation zone, where the liquid that has captured the particulates is removed from the gas stream.

All Oleg Systems Co. air scrubbers use the following principles:

- high liquid-to-gas ration;
- intimate contact between the liquid and dust particles, which may be accomplished by formation of large numbers of small liquid droplets or by breaking up the gas flow into many small bubbles that are driven through a bath of scrubbing liquid, to increase the chances that contaminants will be wetted and collected;
- abrupt transition from dry to wet zones to avoid particle buildup where the dry gas enters the collector.

For additional information please refer to http://olegsystems.com/dustcollector/Index.html.

Oleg Chetchel
Systems Engineer and Designer
Oleg Systems Co.
http://olegsystems.com/fumeextractor/Index.html
http://olegsystems.com/industrialventilation/Index.html

Protect your precious vehicle from dust buildup damaging affects of weather like sun, wind, rain, snow and scratches as well as other hazards. Choose the right cover it will help to protect your car.

Proper maintenance starts with your car’s exterior. This means you have constantly keep it look good by keeping dust and grime away from it. Car dust cover simply functions as a shield.

There are different types of car dust cover. The most popular however, is the custom-made car blanket. A custom made car covers effectively protect your car exterior as it fits your car body perfectly. It also has pockets especially trimmed for your side mirrors.

Most custom-made car covers come with four layers. These layers are especially added to not only protect your car from dusts and dirt, but also from moisture, rain, heat, sleet, and hail. Another ons is a waterproof car covers are also available in car shops. You can ask for the different types of waterproof car covers and then simply select which one suits your car needs.

For more information about Car Cover Protection visit the website, http://cardustcovers.com

Copyright 2005 Dave Markel

Traffic flow: You want to avoid having ductwork running through high traffic areas or in areas where it may affect the safe operation of power tools. It is important to the performance of the dust collection system that the ducting doesn`t get dented or crimped. This reduces air flow and may lead to blockages.

Ductwork arrangement of stationary tools: Especially true with a table saw. It is difficult to duct a table saw upwards. The ducting rising up to the ceiling could be a hazard to the safe operation of the tool. This is where you will need to find another route for the ducting. If you have a crawl space then that is the most practical method.

Location of stationary tools: It is important to keep your distances (runs) from the tools to the dust collection unit at a minimum. If one tool is unnecessarily far from the dust collection unit then it may result in a larger unit to service that run. Move tools if possible to reduce the length of runs.

Step 1. Determine your needs

Depending on what size of wood shop you have or the number of tools you want to add to your dust collection system, you will need to have a system that will accommodate your needs.

You may be able to have a portable system that only services one tool at a time. This is the perfect solution for a small shop and certainly the least expensive.

Step 2. Gather information

Magazines, books, articles and the internet are all great places to start gathering information on dust collection. You want to gather information on collectors and filters, duct work, flexible hose, filter bags, remote on/off switches and grounding kits. Chart the results of your information gathering and compare.

Step 2. Be sure to adhere to all local building codes

Some areas have codes dictating where a dust collection unit may be located or how loud it can be. Checking to be sure there are no codes or bylaws before you build your dust collection system may save you money and time.

Step 3. Laying out your system

First draw a layout for your shop. Show locations of all tools that you intend to hook up to your system. Locate the collector on this drawing as well.

Determine the lengths of the ductwork and the number of fittings. Keep in mind that the smoothness of the duct interior and the number of fittings. These all effect the flow and could increase the size of your dust collection unit.

When making the transition between larger and smaller diameters use tapered connectors to avoid restricting the flow.

Remember to keep it simple. For most small shops a basic system will work just fine. Having 3 fixed outlets dedicated to the tools you use regularly and flexible hose for those that are only used occasionally.

Most dust collection units have 2 in-ports for 2 runs of hose. This will easily accommodate 4 stations especially if only used one at a time.

A dust collection system collects the large shavings and smaller particles but is limited in eliminating very small particles The filter bags are limited when it comes to dust smaller than 10 microns unless you get a dust bag that is designed to capture smaller particles.

The alternative which has other benefits is to get an air filter to “clean” the air in your shop. This is effective in also ridding the air of chemical pollutants from paint, polyurethane and mineral spirits.

——

For more great wood working how to articles visit http://all-wood-working-plans.com/wood-working-articles.html

Copyright 2006 Michael Madigan

Did you know computer equipment continually gives out small amounts of different gases and fine dusts? Some people are highly sensitive to these.

Plastic PC components are one source, as most plastics are unstable and break down naturally over time, especially when exposed to ultraviolet light and sunlight. (That`s the reason why they turn yellow and get brittle.)

Another source comes from vapour produced from traces of manufacturing materials slowly evaporating.

The gases and fumes given off are called `out-gassing` and only occur in small amounts. But when the equipment is new, the out-gassing is greater and noticeable even to people who aren`t particularly sensitive.

This is similar to the smell that we get when we first get into a new car – out-gassing from the vinyl, plastic carpet and hard plastic interiors, as well as the wiring.

A new computer has a similar smell. So to some extent you can avoid outgassing, at least of `new` volatile components, by buying a good quality `used` PC.

Other office materials, particuliarly new furnishings, may also outgas – chipboard contains phenolic resins, which release trace amounts of formaldehyde; also carpeting (especially foam padding), paint and fabrics give off obnoxious chemicals when new.

People who have been sensitized (by previous exposure) may react badly to even very tiny amounts of these gases, by getting headaches, dizziness, and respiratory problems. The problems may persist even when the original cause is reduced, or disappears. In such a case it`s wise to seek qualified medical advice.

Casings may also be contaminated by fine brominated phenolic dust originally put on as a fire retardant, which can be blown out by fans, circulation or movement.

The best solutions are :-

- Initally, to run any new equipment in an empty well ventilated room to allow most of the outgassing to occur before use.

- Always work in a room with good ventilation and avoid continual high room temperatures–outgassing will increase as the temperature rises.

Laser printers emit a lot of toner dust, which contains carbon and solvents, and quite a few people are sensitive to it. You can smell it when the printer is on, and especially on freshly printed-paper. You may notice wheeziness, coughing, and sneezing.

People working at copy centers and service bureaus often suffer from headaches, and toner dust is the main suspect. NCR paper (`carbonless` paper) can also cause wheeziness.

Good ventilation, drawing air away from the operator and filtering out particles, will help reduce these reactions, but effective ventilation in a commercial or home office is sometimes hard to achieve, especially in sealed buildings.

You can try going outdoors and breathing deeply for 10 minutes every hour or so. Open doors, maybe have a fan on., and avoid routine (multiple) photocopying every single document.

Think long term. Removing even mild poisons from your environment is yet another way to keep safe, stay fitter at the PC and enjoy a healthy computing career!

——

Mick Madigan lives in the UK, has a continual interest in healthy computing, and has recently published a fully detailed guide on the ways computing can harm you – and how you can avoid them – at
http://www.m1mart.co.uk
A stress- busting audio/text exercise ebook, plus futher articles on staying fitter at your PC, can also be downloaded without obligation from this site.

Canadian Air Systems Co. is an engineering company for dust collecting systems. Dust collection equipment is available in numerous designs utilizing a number of principles and featuring wide variation in effectiveness, initial cost, operating and maintenance expense, space, arrangements and material of construction.

The following factors determine selection of dust collection equipment:

* Concentration and particle size of contaminant;
* Degree of collection required;
* Characteristics of air or gas stream;
* Characteristics of contaminant;
* Methods of disposal.

Depenging on above factors, the following Canadian Air Systems dry type dust collectors can be utilized:

- Cyclone Dust Collectros

Cyclone Collectors are frequently applied for the removal of coarse dusts from an air stream, as a pre-cleaner to more efficient dry or wet dust collectors and / or as a separator in product conveying systems using an air stream to transport material. Principle advantages are low cost, low maintenance and low pressure drop (in order 0.75″ to 1.5″ WG), but this type dust collector can not be used for collection of fine particles.

- High Efficiency Centrifugal Collectors

Have been developed whereby higher centrifugal forces are exerted on dust particles in a gas stream. Improvement in dust separation efficiency has been obtained by 1) increasing velocities through a cyclone shape dust collector, 2) utilizing a skimmer or other design feature, 3) using a number of small diameter cyclones in parallel and 4) placing units in series in some unusual applications.

- Dry Type Dynamic Precipitators

In this collector, dust is precipitated by centrifugal force on to specially shaped blades on an exhauster wheel and then conveyed through a dust circuit in the fan casing to the dust storage hopper.

- Louver Type Dust Collectors

Centrifugal forces can be applied to a particle by a rapid change in direction of air flow by series of plates set at an angle to the air stream. Coarse particles traverse the air stream and will project back to the dirty air side by the forces that can be produced from such an impact.

- Settling Chambers

Dust is ettled out in a large chamber when conveying velocities are reduced to the point where the particles are no longer conveyed. Extreme space requirements and the presence of edde currents to nullify the effective velocity mean that settling chamber type of dust collectors can be used only for removal of extremely coarse particles.

- Potable Unit Collectors

To fill the need for dust collection from isolated, portable or frequently relocated dust producing operations, a number of unit collector designs are availbale having capacities in the range of 200 to 1,000 CFM. Featuring small space and designed to recirculate the air, collectors of this type have been used extensively, especially in the metal working industry.

A stationary Cyclone Type Dust Collector is one of the most popular choices for industrial users due to it low initial cost and simple maintenance.

Cyclone dust collector provides a simple and economical means to most medium to coarse dust collection applications. The centrifugal action and gravitational forces are the basic plinciples of its operatrion. The dust laden air enters the dust collector through ahigh velocity inlet forcing the dust particles to the collector wall in spiral motion. This, together with gravitational pull, forces the concentrated dust downward and out of the dust outlet, while the cleaned air travels upward via the inner vortex and out the air outlet on the top side of the dust collector.

For abrasive or corrosive applications, special cmaterials of construction are available, such as abrasion resistant carbon steel, stainless steel, special alloys, rubber liners, etc… Many sizes and arrangements of cyclone dust collectors are available from Canadian Air Systems to meet specific capacities and space requirements.

For additional information please refer to http://www.nis-co.com/dustcollection/Index.html.

Oleg Tchetchel
Process air systems designer
Canadian Air Systems
http://www.nis-co.com/index.html
http://www.nis-co.com/dustcollector/Index.html

Canadian Air Systems Co. designs industrial dust collection systems. Dust collecting equipment is available in numerous designs utilizing a number of principles and featuring wide variation in effectiveness, initial cost, operating and maintenance expense, space, arrangements and material of construction. One of the most widely used type of dust collector is Canadian Air Systems Fabric Dust Collector.

In fabric type dust collector one of the most important design tasks is to arrnage an effective method of filter cleaning. Generally, large dust collection installations are comparmented and use off-line filters cleaning.

When a single dust collector compartment is needed to be cleaned off line during working shift change or breaks, shaker type fabric filters are usually the least expensive choice The fabric media is a shaker-type fabric filter, whether formed into cylindrical tubes or rectangular envelopes, is mechanical agitated to remove the dust cake.

If the fabric filter can not be stopped for cleaning, the dust collector is divided into a number of independent sections that are sequentially taken off line for cleaning. Because it is usually difficult to maintain a good seal with dampers, relief dampers are often included. The relief dampers introduce a small volume of reverse gas to keep the gas flow at the fabric suitable for dust cake removal. Use of comaprtments, with their frequent cleaning cycles, does not permit a substantial increase in flow rates over those of a single-compartment unit cleaned periodically. The best situation for fabric reconditioning is when the system is stopped because even small particles will then fall into the hopper. Continuosly cleaned dust collecting units have compartment valves that close for the shaking cycle.

The gas-to-media ratio for a shaker-type dust collector is usually in the range of 2 to 4 ppm; it might be lower for the collector filters particles that are predominantly smaller then 2 microns. The abatement of metallurgical fumes is one example where a shaker collector is used to control particles that are less than one micron in size.

For ambient air temperature application, a wooven cotton or polupropylene fabric is usually selected for shaker-type fabric filters. Synthetics are chosen for their resistance to elevated temperature and to chemicals.

Fabric arresters are high efficiency, medium cost collectors. The effectiveness of passing air or gas through a fabric at low velocity has been recofnized and used for many years in air cleaning devices. Fabric is arranged in envelope or tubular (stocking) shapes. While removal appears to take place by a staining action of the media, in reality dust collection is obtained by building up a mat of the material on the dirty side of the media. This mat provides the actual filtering or straining bed. By means of this bed a high degree of removal is obtained even on sub-micron size particles.

The dust collectors are used extensively in industry for a wide range of applications. They require more space than most other types of air cleaning devices, necessiating outdoor installation in most cases.

Some spesific types of Fabric Dust Collectors engineered by Canadian Air Systems Co. are:

* INTERMITTENT DUTY FABRIC DUST COLLECTORS

* MULTIPLE-SECTION, CONTINUOUS DUTY, AUTOMATIC FABRIC DUST COLLECTORS

* REVERSE-JET, CONTINUOUS-DUTY, FABRIC COLLECTORS

* REVERSE-FLOW COLLAPSE, CONTINUOUS DUTY DUST COLLECTORS

For additional information please refer to http://nis-co.com/fumeextractor/Index.html.

Oleg Tchetchel
Designer of Air Moving Systems
Canadian Air Systems
http://nis-co.com/contact/Index.html
http://nis-co.com/fumecollector/Index.html