170:
441:) consists of a large box installed in the ductwork. The increase of cross section area at the chamber reduces the speed of the dust-filled airstream and heavier particles settle out. Settling chambers are simple in design and can be manufactured from almost any material. However, they are seldom used as primary dust collectors because of their large space requirements and low efficiency. A practical use is as precleaners for more efficient collect. Advantages: 1) simple construction and low cost 2) maintenance free 3) collects particles without need of water. Disadvantages: 1) low efficiency 2) large space required.
635:
609:
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series of disposable or cleanable pre-filters, a disposable vee-bag or cartridge filter. HEPA or carbon final filter modules can also be added. Various models are available, including free-hanging or ducted installations, vertical or horizontal mounting, and fixed or portable configurations. Filter cartridges are made out of a variety of synthetic fibers and are capable of collecting sub-micrometre particles without creating an excessive pressure drop in the system. Filter cartridges require periodic cleaning.
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Methods of disposal – Methods of dust removal and disposal vary with the material, plant process, volume, and type of collector used. Collectors can unload continuously or in batches. Dry materials can create secondary dust problems during unloading and disposal that do not occur with wet collectors.
502:
Secondary-air-flow separators use a secondary air flow, injected into the cyclone to accomplish several things. The secondary air flow increases the speed of the cyclonic action making the separator more efficient; it intercepts the particulate before it reaches the interior walls of the unit; and it
937:
A wet scrubber, or venturi scrubber, is similar to a cyclone but it has an orifice unit that sprays water into the vortex in the cyclone section, collecting all of the dust in a slurry system. The water media can be recirculated and reused to continue to filter the air. Eventually the solids must be
840:
Vane-axial fans - Vane-axial fans are similar to tube-axial fans except air-straightening vanes are installed on the suction or discharge side of the rotor. They are easily adapted to multistaging and can develop static pressures as high as 14 to 16 in. wg (3.483 to 3.98 kPa). They are normally
742:
Characteristics of dust – Moderate to heavy concentrations of many dusts (such as dust from silica sand or metal ores) can be abrasive to dry centrifugal collectors. Hygroscopic material can blind bag collectors. Sticky material can adhere to collector elements and plug passages. Some particle sizes
479:
Centrifugal collectors use cyclonic action to separate dust particles from the gas stream. In a typical cyclone, the dust gas stream enters at an angle and is spun rapidly. The centrifugal force created by the circular flow throws the dust particles toward the wall of the cyclone. After striking the
370:
Dust collection systems are often part of a larger air quality management program that also includes large airborne particle filtration units mounted to the ceiling of shop spaces and mask systems to be worn by workers. Air filtration units are designed to process large volumes of air to remove fine
906:
cartridge dust collector. A cyclone separator or dryer may be placed before these units to reduce heat or moisture content before reaching the filters. Furthermore, some units may have third and fourth stage filtration. All separation and filtration systems used within the unit should be specified.
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consist of a wheel or a rotor mounted on a shaft that rotates in a scroll-shaped housing. Air enters at the eye of the rotor, makes a right-angle turn, and is forced through the blades of the rotor by centrifugal force into the scroll-shaped housing. The centrifugal force imparts static pressure to
595:
Electrostatic precipitators use electrostatic forces to separate dust particles from exhaust gases. A number of high-voltage, direct-current discharge electrodes are placed between grounded collecting electrodes. The contaminated gases flow through the passage formed by the discharge and collecting
559:
There is a large variety of wet scrubbers; however, all have one of three basic configurations of gas-humidification, gas-liquid contact or gas-liquid separation - Regardless of the contact mechanism used, as much liquid and dust as possible must be removed. Once contact is made, dust particulates
255:
Dust collectors are used in many processes to either recover valuable granular solid or powder from process streams, or to remove granular solid pollutants from exhaust gases prior to venting to the atmosphere. Dust collection is an online process for collecting any process-generated dust from the
1040:
Ed. Wilh. Straus: "Erste und älteste
Spezialfabrik fĂĽr Industrie - Entstaubung, Staubsammlung und Raumlufttechnik", in: LĂĽbeck seit Mitte des 18. Jahrhunderts; Herausgeber: LĂĽbeckische Anzeigen und LĂĽbecker Zeitung, LĂĽbeck 1926, S. 340-346, S. 341 vgl. des Weiteren zur Firmengeschichte Fahl 1935,
806:
Backward-blade fans - Backward-blade fans operate at higher tip speeds and thus are more efficient. Since material may build up on the blades, these fans should be used after a dust collector. Although they are noisier than radial-blade fans, backward-blade fans are commonly used for large-volume
734:
Degree of dust collection required – The degree of dust collection required depends on its potential as a health hazard or public nuisance, the plant location, the allowable emission rate, the nature of the dust, its salvage value, and so forth. The selection of a collector should be based on the
701:
Use of unit collectors may not be appropriate if the dust-producing operations are located in an area where central exhaust systems would be practical. Dust removal and servicing requirements are expensive for many unit collectors and are more likely to be neglected than those for a single, large
933:
An impinger system is a device in which particles are removed by impacting the aerosol particles into a liquid. Modular media type units combine a variety of specific filter modules in one unit. These systems can provide solutions to many air contaminant problems. A typical system incorporates a
901:
Important parameters in specifying dust collectors include airflow the velocity of the air stream created by the vacuum producer; system power, the power of the system motor, usually specified in horsepower; storage capacity for dust and particles, and minimum particle size filtered by the unit.
905:
Systems for fine removal may only contain a single filtration system (such as a filter bag or cartridge). However, most units utilize a primary and secondary separation/filtration system. In many cases the heat or moisture content of dust can negatively affect the filter media of a baghouse or
738:
Characteristics of airstream – The characteristics of the airstream can have a significant impact on collector selection. For example, cotton fabric filters cannot be used where air temperatures exceed 180 °F (82 °C). Also, condensation of steam or water vapor can blind bags. Various
498:
Multiple-cyclone separators consist of a number of small-diameter cyclones, operating in parallel and having a common gas inlet and outlet, as shown in the figure, and operate on the same principle as single cyclone separators—creating an outer downward vortex and an ascending inner vortex.
836:
Tube-axial fans - Tube-axial fans are similar to propeller fans except they are mounted in a tube or cylinder. Therefore, they are more efficient than propeller fans and can develop up to 3 to 4 in. wg (743.3 to 995 Pa). They are best suited for moving air containing substances such as
403:
Inertial separators separate dust from gas streams using a combination of forces, such as centrifugal, gravitational, and inertial. These forces move the dust to an area where the forces exerted by the gas stream are minimal. The separated dust is moved by gravity into a hopper, where it is
653:
Unlike central collectors, unit collectors control contamination at its source. They are small and self-contained, consisting of a fan and some form of dust collector. They are suitable for isolated, portable, or frequently moved dust-producing operations, such as bins and silos or remote
654:
belt-conveyor transfer points. Advantages of unit collectors include small space requirements, the return of collected dust to main material flow, and low initial cost. However, their dust-holding and storage capacities, servicing facilities, and maintenance periods have been sacrificed.
668:
Fabric collectors are frequently used in minerals processing operations because they provide high collection efficiency and uninterrupted exhaust airflow between cleaning cycles. Cyclone collectors are used when coarser dust is generated, as in woodworking, metal grinding, or machining.
322:. This is done via a ducting system, properly sized and manifolded to maintain a consistent minimum air velocity required to keep the dust in suspension for conveyance to the collection device. A duct of the wrong size can lead to material settling in the duct system and clogging it.
263:
Mist collectors remove particulate matter in the form of fine liquid droplets from the air. They are often used for the collection of metal working fluids, and coolant or oil mists. Mist collectors are often used to improve or maintain the quality of air in the workplace environment.
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Electrostatic precipitators are a type of air cleaner, which charges particles of dust by passing dust-laden air through a strong (50-100 kV) electrostatic field. This causes the particles to be attracted to oppositely charged plates so that they can be removed from the air stream.
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Dust collectors vary widely in design, operation, effectiveness, space requirements, construction, and capital, operating, and maintenance costs. Each type has advantages and disadvantages. However, the selection of a dust collector should be based on the following general factors:
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efficiency required and should consider the need for high-efficiency, high-cost equipment, such as electrostatic precipitators; high-efficiency, moderate-cost equipment, such as baghouses or wet scrubbers; or lower cost, primary units, such as dry centrifugal collectors.
503:
forces the separated particulate toward the collection area. The secondary air flow protects the separator from particulate abrasion and allows the separator to be installed horizontally because gravity is not depended upon to move the separated particulate downward.
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Choosing the right size dust collector depends on airflow volume and air-to-cloth ratio that determine the efficiency of a system. Optimal dust collecting equipment increases employee retention and preserves equipment that helps lower maintenance and replacement
487:
Single-cyclone separators create a dual vortex to separate coarse from fine dust. The main vortex spirals downward and carries most of the coarser dust particles. The inner vortex, created near the bottom of the cyclone, spirals upward and carries finer dust
528:, fabric collectors use filtration to separate dust particulates from dusty gases. They are one of the most efficient and cost-effective types of dust collectors available, and can achieve a collection efficiency of more than 99% for very fine particulates.
457:
Baffle chambers use a fixed baffle plate that causes the conveying gas stream to make a sudden change of direction. Large-diameter particles do not follow the gas stream but continue into a dead air space and settle. Baffle chambers are used as precleaners
824:
Axial-flow fans are used in systems that have low resistance levels. These fans move the air parallel to the fan's axis of rotation. The screw-like action of the propellers moves the air in a straight-through parallel path, causing a helical flow pattern.
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Cyclone separators are found in all types of power and industrial applications, including pulp and paper plants, cement plants, steel mills, petroleum coke plants, metallurgical plants, saw mills and other kinds of facilities that process dust.
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and other impurities from air or gas. Designed to handle high-volume dust loads, a dust collector system consists of a blower, dust filter, a filter-cleaning system, and a dust receptacle or dust removal system. It is distinguished from
955:– filter cleaning accomplished during dust collector shut down. Practical whenever the dust loading in each dust collector cycle does not exceed the filter capacity. Allows for maximum effectiveness in dislodging and disposing of dust.
973:– Filter cleaning method in which high-velocity compressed air forced through a flexible tube results in an arbitrary rapping of the filter to dislodge the dust cake. Especially effective when the dust is extremely fine or sticky.
814:
Forward-curved-blade fans - These fans have curved blades that are tipped in the direction of rotation. They have low space requirements, low tip speeds, and a low noise factor. They are usually used against low to moderate static
832:
Propeller fans - These fans are used to move large quantities of air against very low static pressures. They are usually used for general ventilation or dilution ventilation and are good in developing up to 0.5 in. wg (124.4
754:
Choosing a too-large, undersized, or incapable dust collector can cause plenty of issues that impact performance and maintenance costs. Hence, the dust collector should be chosen in such a way that suits the company's specific
802:
Radial-blade fans - Radial-blade fans are used for heavy dust loads. Their straight, radial blades do not get clogged with material, and they withstand considerable abrasion. These fans have medium tip speeds and medium noise
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The airborne particles receive a negative charge as they pass through the ionized field between the electrodes. These charged particles are then attracted to a grounded or positively charged electrode and adhere to it.
421:
Neither settling chambers nor baffle chambers are commonly used in the minerals processing industry. However, their principles of operation are often incorporated into the design of more efficient dust collectors.
556:. In these systems, the scrubbing liquid (usually water) comes into contact with a gas stream containing dust particles. Greater contact of the gas and liquid streams yields higher dust removal efficiency.
580:
Due to the large number of commercial scrubbers available, it is not possible to describe each individual type here. However, the following sections provide examples of typical scrubbers in each category.
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Downdraft tables - A downdraft table is a self-contained portable filtration system that removes harmful particulates and returns filtered air back into the facility with no external ventilation required.
1041:
S.116-117; Lübeckische Blätter 1890, S. 404, Meldung 245, Local und vermischte
Notizen: W. F. L. Beth wurde ein Patent erteilt Nr. 53553 vom 20. Oktober 1889 fĂĽr LĂĽftungseinrichtungen in Eisenbahnwaggons
267:
Fume and smoke collectors are used to remove sub-micrometer-size particulates from the air. They effectively reduce or eliminate particulate matter and gas streams from many industrial processes such as
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Dust-laden gases enter the baghouse and pass through fabric bags that act as filters. The bags can be of woven or felted cotton, synthetic, or glass-fiber material in either a tube or envelope shape.
315:. This is accomplished with devices such as capture hoods to catch dust at its source of origin. Many times, the machine producing the dust will have a port to which a duct can be directly attached.
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source point on a continuous basis. Dust collectors may be of single unit construction, or a collection of devices used to separate particulate matter from the process air. They are often used as an
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A baghouse is an air pollution abatement device used to trap particulate by filtering gas streams through large fabric bags. They are typically made of glass fibers or fabric.
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or baffled canister, before drawing the air through the impeller. Air from these units can then be exhausted outdoors or filtered and recirculated back into the work space.
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Other considerations when choosing a dust collection system include the temperature, moisture content, and the possibility of combustion of the dust being collected.
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Disposal of wet slurry or sludge can be an additional material-handling problem; sewer or water pollution problems can result if wastewater is not treated properly.
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Dust concentration and particle size – For minerals processing operations, the dust concentration can range from 0.1 to 5.0 grains (0.32 g) of dust per
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A number of designs are available, with capacities ranging from 200 to 2,000 ft/min (90 to 900 L/s). There are two main types of unit collectors:
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and shapes may rule out certain types of fabric collectors. The combustible nature of many fine materials rules out the use of electrostatic precipitators.
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Multiple-cyclone separators remove more dust than single cyclone separators because the individual cyclones have a greater length and smaller diameter.
329:. This is done via a variety of means, depending on the application and the dust being handled. It can be as simple as a basic pass-through filter, a
1161:
961:– filter cleaning initiated automatically when the filter is fully loaded, as determined by a specified drop in pressure across the media surface.
233:
967:– Filter cleaning method which delivers blasts of compressed air from the clean side of the filter to dislodge the accumulated dust cake.
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Motors are selected to provide sufficient power to operate fans over the full range of process conditions (temperature and flow rate).
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It must provide a safe and healthy work environment for the employees. Moreover, employee efficiency and production should not ignore.
949:– automatically timed filter cleaning which allows for continuous, uninterrupted dust collector operation for heavy dust operations.
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Collection booths - Collector booths require no ductwork, and allow the worker greater freedom of movement. They are often portable.
880:
Ambient units - Ambient units are free-hanging systems for use when applications limit the use of source-capture arms or ductwork.
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The fan and motor system supplies mechanical energy to move contaminated air from the dust-producing source to a dust collector.
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and deposited into a container such as a bag, barrel, or canister. Air is recirculated into the shop after passing through a
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Proper dust collection and air filtration is important in any work space. Repeated exposure to wood dust can cause chronic
61:
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A cyclone separator is an apparatus for the separation, by centrifugal means, of fine particles suspended in air or gas.
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the air. The diverging shape of the scroll also converts a portion of the velocity pressure into static pressure.
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Source collector or
Portable units - Portable units are for collecting dust, mist, fumes, or smoke at the source.
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and water droplets combine to form agglomerates. As the agglomerates grow larger, they settle into a collector.
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is a system used to enhance the quality of air released from industrial and commercial processes by collecting
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375:) suspended in the air. Masks are available in a variety of forms, from simple cotton face masks to elaborate
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1191:"Evaluation of Occupational Exposures and Indoor Environmental Quality in an Underground Cavern Workplace"
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with tanked air — the need for which is determined by the environment in which the worker is operating.
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electrodes. Electrostatic precipitators operate on the same principle as home "Ionic" air purifiers.
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The unit maintains its rated capacity while accumulating large amounts of dust between cleanings.
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Smaller dust collection systems use a single-stage vacuum unit to create suction and perform air
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Has the ability to operate unattended for extended periods of time (for example, 8 hours).
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Automatic discharge or sufficient dust storage space to hold at least one week's accumulation.
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247:. In 1921, he patented three filter designs that he had pioneered to remove dust from air.
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If renewable filters are used, they should not have to be replaced more than once a month.
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Fabric collectors, with manual shaking or pulse-jet cleaning - normally used for fine dust
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High-energy scrubbers (greater than 15 inches water gauge - greater than 3.731 kPa)
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Medium- to high-energy scrubbers (6 to 15 inches water gauge - 1.493 to 3.731 kPa)
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Low- to medium-energy scrubbers (2.5 to 6 inches water gauge - 0.622 to 1.493 kPa)
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Brueck, Scott E.; Hammond, Duane R.; Zwack, Leonard M.; Hatcher, Sarah (August 2023).
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Spray-tower scrubber wet scrubbers may be categorized by pressure drop as follows:
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Larger systems utilize a two-stage system, which separates larger particles from
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Simple cleaning operations do not increase the surrounding dust concentration.
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Low-energy scrubbers (0.5 to 2.5 inches water gauge - 124.4 to 621.9 Pa)
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The following points should be considered when selecting a unit collector:
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chemicals can attack fabric or metal and cause corrosion in wet scrubbers.
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Additional information on various wet scrubber topologies and techniques
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Stationary units - An example of a stationary collector is a baghouse.
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Dust collectors can be configured into one of five common types:
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Cleaning efficiency must comply with all applicable regulations.
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wall, these particles fall into a hopper located underneath.
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U.S. National
Institute for Occupational Safety and Health
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are used to supply the necessary energy to drive the fan.
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1117:, HSE information sheet CIS69, accessed 27 April 2021
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Controlling construction dust with on-tool extraction
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Dust collection systems work on the basic formula of
121:"Filter bag" redirects here. For coffee filters, see
1001:, which can become airborne and lodge deeply in the
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The three primary types of inertial separators are:
997:. Wood dust also frequently contains chemicals and
623:, within a storage warehouse in a former limestone
49:. Unsourced material may be challenged and removed.
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723:), and the particle size can vary from 0.5 to 100
664:Cyclone collectors - normally used for coarse dust
897:Parameters involved in specifying dust collectors
337:, a multistage baghouse, or a chemically treated
1273:
798:There are three main types of centrifugal fans:
619:with exhaust duct connected to a dust collector
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938:removed from the water stream and disposed of.
156:, which use disposable filters to remove dust.
1223:"Health Hazards > Wood Dust - Carcinogens"
775:There are two main kinds of industrial fans:
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552:Dust collectors that use liquid are known as
348:, where the waste material is drawn into an
260:device to maintain or improve air quality.
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1266:EPA Air Pollutants and Control Techniques
1162:"Baghouse / Fabric Filters KnowledgeBase"
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363:using a pre-collection device, such as a
109:Learn how and when to remove this message
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828:The three main kinds of axial fans are:
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386:are used to prevent buildup of dust in
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1008:Another concern is the possibility of
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232:The father of the dust collector was
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1148:participating institution membership
1113:Health and Safety Executive (2013),
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47:adding citations to reliable sources
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1229:. United States Department of Labor
1053:Shaking device for cleaning filters
811:because of their higher efficiency.
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1249:"Tips to Reduce Dust in Your Home"
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453:Diagram of a Baffle Chamber
187:Left, Wilhelm Beth. Right,
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1135:Oxford English Dictionary
318:Second, the dust must be
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1138:(Online ed.).
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32:This article
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1231:. Retrieved
1226:
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1206:. Retrieved
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1170:. Retrieved
1166:the original
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41:Please help
36:verification
33:
1287:Air filters
725:micrometres
721:cubic meter
702:collector.
377:respirators
373:micrometres
303:First, the
237: [
1276:Categories
1233:22 January
1208:2024-05-31
1172:2013-09-08
1150:required.)
1101:2017-08-08
1095:Air-filter
1080:2017-08-08
1059:2017-08-08
1028:References
983:bronchitis
863:Figure 1.
815:pressures.
755:workplace.
717:cubic foot
627:cavern in
539:See also:
488:particles.
346:filtration
69:newspapers
987:emphysema
640:miter saw
638:Compound
614:table saw
612:Woodshop
526:baghouses
439:stiveroom
361:fine dust
327:collected
313:extracted
278:quenching
274:tempering
221:July 2013
99:July 2013
1016:See also
803:factors.
513:Baghouse
350:impeller
320:conveyed
309:captured
307:must be
134:Pristina
1129:"stive"
867:example
727: (
694:Durable
365:cyclone
298:collect
290:capture
284:Process
270:welding
160:History
83:scholar
995:cancer
751:costs.
625:quarry
617:(left)
354:filter
294:convey
276:, and
245:LĂĽbeck
191:(1910)
138:Kosovo
85:
78:
71:
64:
56:
1194:(PDF)
1144:
1003:lungs
999:fungi
697:Quiet
394:Types
384:ducts
243:from
241:]
90:JSTOR
76:books
1282:Dust
1235:2021
1227:OSHA
833:Pa).
629:Ohio
305:dust
296:and
251:Uses
149:dust
62:news
991:flu
989:, "
311:or
216:.
45:by
1278::
1225:.
1196:.
1181:^
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985:,
729:ÎĽm
390:.
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239:de
143:A
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87:·
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39:.
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