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psi-woodworking-dust-collection-zone Iron ore, loose Lead 0. Fabrics produced by these systems are referred to individually as "spun bounded", "meltblown", and "textured" or "apertured film" nonwovens; or, generically, duat "polymer laid" nonwovens. Volt -A unit of electrical potential or pressure. Vaneaxial Fan -Axial fan with either inlet or discharge guide vanes or both. Hertz -Frequency measured in psi woodworking dust collection zone per second.

Sawdust can make a floor slippery and can catch fire if hit by a stray spark. It can decrease the quality of your woodworking, too, by wearing on your tools and preventing you from keeping the stock in constant contact with the cutter. The good news is that dealing with dust doesn't have to be difficult or outrageously expensive. Rockler has worked hard to make dust collection an easy add-on to any woodworking machine. Our innovative Dust Right line includes a wall-mounted dust collector that provides plenty of suction without taking up floor space, expandable hose that stretches to seven times its storage length and all the couplers, adapters and accessories you need to bring dust collection to every corner of your shop.

Our hose clamps and pipe hangers ensure leak-free attachments and a solid installation. If for any reason you are not satisfied with the merchandise you ordered, just return it within 90 days to receive a refund in the manner of original payment. For these items, please call the store where you purchased them or our customer service department at so we can assist you. Your order will come with a return form with convenient instructions, or you may send your returns directly to Returns Department, Rockler Woodworking and Hardware, Willow Drive, Medina, MN You may also return purchases to a Rockler store Psi Woodworking Dust Collection Hose Quote near you for store credit.

Items shipped directly from the manufacturer cannot be returned in store. For international returns, please click here. Dust Collectors. Air Filtration. Dust Separators. While negligible at low pressure and volumes, high pressure fan selection must be based on rarefied inlet density.

Ravel Strip Tensile -The tension strength, in pounds per inch of a 6" long textile sample cut, cut just over one inch wide, with yarns peeled off each side down to exactly one inch wide pulled in two lengthwise between jaws set 3" apart and pulled at a constant specified speed. The type of test always used unless specified. ASTM specs are available at technical libraries. Re-entrainment -The phenomenon whereby dust is collected from the air stream and then is returned to the air stream.

Occurs when dust is pulsed from a bag and then caught up by an upward moving air stream. Relative Humidity -The ratio of existing water vapor to that of saturated air at the same dry-bulb temperature.

Repeat -The number of threads in a weave before the weave repeats or starts over again. The number of ends and picks in the repeat may be equal or unequal but in every case the repeat must be in a rectangular form.

Repressuring Baghouse -Baghouse using bags that are cleaned by flowing air backwards through the cloth. Same as reverse air baghouse. Repowering -The replacement of an existing coal-fired boiler with one or more clean coal technologies, in order to achieve significantly greater emission reduction relative to the performance of technology in widespread use as of the enactment of the Clean Air Act Amendments.

Resistance -In air flow, it is caused by friction of the air against any surface, or by changing the momentum of the gas. Reverse Air Baghouse -Baghouse using bags that are cleaned by flowing air backwards through the cloth, to cause dust cake release. Reverse Jet -See pulse jet. Reynolds Number -A mathematical factor used to express the relation between velocity, viscosity, density, and dimensions in a system of flow, used to define fan proportionality.

Ringelman -A measure of the opacity caused by pollution from a stack. Grades opacity from 0 to 5, where 0 is an invisible discharge and 5 is totally opaque. Ringelman Chart -Actually, a series of charts, numbered from 0 to 5, that simulate various smoke densities, by presenting different percentages of black.

A Ringelman No. They are used for measuring the opacity of smoke rising from stacks and other sources, by matching with the actual effluent, the various numbers, or densities, indicated by the charts. Ringelman numbers were sometimes used in setting emission standards. Rotor -The rotating part of most AC motors. Scour -A soap and water wash to "off loom" fabric. RPM - Scroll -The general shape of a centrifugal fan housing; the formed piece to which housing sides are welded.

Scrubber -A device that uses a liquid spray to remove aerosol and gaseous pollutants from an air stream. The gases are removed either by absorption or chemical reaction.

Solid and liquid particulates are removed through contact with the spray. Scrubbers are used for both the measurement and control of pollution.

Scrubber, Gas -Any device in which a contaminant, solid or gaseous, is removed from a gas stream by liquid droplets. Types include spray towers, packed towers, cyclone scrubbers, jet scrubbers, orifice scrubbers, venturi scrubbers, impingement scrubbers, and mechanical scrubbers.

Secondary Collector -A dust collector which is preceded by primary collector s. The secondary filter normally has a higher filtering efficiency. Seeding -The application of a relatively coarse, dry dust to a bag or cartridge before start-up to provide an initial filter cake for immediate high efficiency and to protect bags from blinding.

Also, in crystallizing, seeding is used to start the crystallization process. Sensible Heat -Any portion of heat which affects a change in a substance's temperature but does not alter that substance's state. Series Fans -A combination of fans connected such that the outlet of one fan exhausts into the inlet of another. Fans connected in this manner are capable of higher pressures than a single fan and are used to meet pressure requirements greater that single fans.

Service Factor -The number by which the horsepower rating is multiplied to determine the maximum safe load that a motor may be expected to carry continuously. Settling Chamber -A dry collection device which removes particulate matter from the gas stream by slowing down the exhaust gas velocity. Shaded-Pole Motor -A special type of single-phase induction motor. Low starting torque, low cost. Usually used on direct-drive fans.

Shaft Seal -A device to limit gas leakage between the shaft and fan housing. Shaker Baghouse -A baghouse using woven cloth bags; cleaning occurs by shaking bags from the top. SI Units -Systeme International d'Unites, International System of Units, any one of the units of measure in the international meter-kilogram-second system. Silicone Finish -A treatment of felted bags with silicone to provide a slick finish for improved dust release.

Most commonly used on Dacron polyester and fiberglass bags. Singed Finish -A felted bag finish that is designed to provide a finish similar to calendering. The "hairs" are burned off to provide a smoother finish. Singeing -The burning off of the protruding fibers from the warp and filling yarns of the fabric. Singles -The term used to imply only one yarn.

SIP State Implementation Plan -Documents prepared by states, and submitted to EPA for approval, which identifies actions and programs to be undertaken by the State and its subdivisions to implement their responsibilities under the Clean Air Act.

Sizing -A protective coating applied to yarn to ensure safe handling, e. Skrim -A woven fabric that felt is needled onto. Slip -The percentage difference between synchronous and operating speeds. Slippage -The movement of yarns in a fabric due to insufficient interlacings.

Smog -The irritating haze resulting from the sun's effect on certain pollutants in the air, notably those from automobile exhaust; see photochemical process. Also a mixture of fog and smoke. Smoke -Carbon or soot particles, less than 0. SO 2 -Sulfur dioxide is an invisible, non-flammable acidic gas, formed during combustion of fuel containing sulfur. Soot -Very finely divided carbon particles clustered together in long chains. Second-Power Level -Acoustic power radiating from a sound source.

Expressed in watts or decibels. Sound-Pressure Level -The acoustic pressure at a point in space where the microphone or listener's ear is situated. Expressed in units or pressure or in decibels.

Source -Any place or object from which pollutants are released. SP -Static pressure; pressure as measured in all directions within an air-handling system, not including the force or pressure of air movement. Specific Gravity -The ratio of the weight or mass of a given volume of any substance to that of an equal volume of some other substance taken as a standard.

The ratio of the density of andy gas to the density of dry air at the same temperature and pressure is the specific gravity of the gas. Specific Heat -The ratio of the quantity of heat required to raise a certain volume one degree to that required to raise an equal volume of water one degree.

Split-Phase Motor -The most common type of single-phase induction motor. Spun Fabric -Fabric woven from staple spun fabric. Squirrel-Cage Winding -A permanently short-circuited winding , usually uninsulated and chiefly used in induction motors, having its conductors uniformly distributed around the periphery of the machine and joined by continuous end rings.

Stack -A smokestack, a vertical pipe or flue designed to exhaust gases. SRC -Stage II Controls -Systems placed on service station gasoline pumps to control and capture gasoline vapors during an automobile refueling. Standard Air Density Starting Torque -The torque produced by a motor as it begins to turn from a standstill and accelerate. Sometimes called locked rotor torque. Static Balance -The mechanical balance of a rotating part or assembly by adding weights to counter-balance gravitational rotating of the part without power driving it.

Static Pressure Cold -The pressure caused by the resistance to air flow through the system if the gas were at standard conditions or colder, if this is a possibility. Static Pressure Hot -The pressure caused by the resistance to air flow through the system at actual conditions. Measured in inches of water WG. Stator -The stationary parts of a magnetic circuit with associated windings. Streamline Flow -Fluid flow in which Woodworking Dust Collection Systems 80 the velocity pressure and fluid density of a given particle remains constant with time.

Stoichlometric Air -The exact quantity of air required to combine with the given fuel so that the ensuing combustion reaction is perfect and no free oxygen or unburned constituents remain.

In reality, air in excess of the stoichlometric ratio is usually provided to encourage complete combustion of the fuel. Sulfur Dioxide SO 2 -A heavy, pungent, colorless air pollutant formed primarily by the combustion of fossil fuels. It is a respiratory irritant, especially for asthmatics and is the major precursor to the formation of acid rain.

Sulfur Oxides -Pungent, colorless gases formed primarily by the combustion of fossil fuels; considered major air pollutants; sulfur oxides may damage the respiratory tract as well as vegetation. Surge Limit -That point near the peak of the pressure curve which corresponds to the minimum flow at which the fan can be operated without instability.

System -A series of ducts, conduits, elbows, filters, diffusers, etc. A fan provides the energy necessary to overcome the system's resistance to flow and causes air or gas to flow through the system.

System Curve -Graphic presentation of the pressure versus volume flow rate characteristics of a particular system. System Effect -The effect on the performance of a fan resulting from the difference between the fan inlet and outlet connections to the actual system, and the standardized connections used in laboratory tests to obtain fan-performance ratings.

System gas Volume -All gases flowing through the exhaust gas system including excess air, scavenger air, leakage air. TTachometer -an instrument which measures the speed of rotation, usually in RPM. Tape Sampler -A device used in the measurement of both gases particulates.

It allows air sampling to be made automatically at predetermined times. Tensile Strength -The maximum stress a material can withstand before it breaks; expressed in pounds per square inch. Test Block -An operating point above and beyond the maximum specified continuous rating demonstrating the fan margin to the customer.

Textile -That which is or may be woven. Comes from the Latin "Texere" to weave. Hence any kind of fabric. Thread Count -The number of warp and filling yarns in a fabric commonly expressed in square inch. Threshold Limit Values TLV -Represents the air concentrations of chemical substances to which it is believed that workers may be exposed daily without adverse effect.

Tip Speed -Fan wheel velocity at a point corresponding to the outside diameter of the wheel blades; normally expressed in feet per minute circumference times RPM. Traverse -A method of sampling points in a duct where pressure readings will be taken to determine velocity. A traverse divides the duct into equal, evenly distributed areas that are each tested, compensating for errors caused by uneven gas flow in the duct. TSCA Toxic Substances Control Act -Administered by the Environmental Protection Agency EPA , was passed by Congress to protect human health and the environment by requiring testing and necessary use restrictions to regulate the commerce of certain chemical substances.

Tubeaxial Fan -Axial fan without guide vanes. Tubesheet -The steel plate that bags and cages are suspended from. Separates the clean air and dirty air sections of the baghouse. Sometimes called cellplate, a term usually used for inside collector baghouses.

Tubular Centrifugal Fan -Fan with a centrifugal impeller within a cylindrical housing discharging the gas in an axial direction. Turbulent Flow -Airflow in which true velocities at a given point vary erratically in speed and direction. Turning Vanes -Baffles put in a duct to straighten out the air flow. Twist -The number of complete spiral turns in a yarn, in a right or left direction, e.

UUnbalance -The condition of a rotor in which its rotation results in centrifugal force being applied to the rotor's supporting bearings. Uniform Flow -Airflow in which velocities between any two given points remain fairly constant. VValve -In baghouses, frequently the pilot valve and the diaphragm valve pulse are considered as one, simply called "valve.

Vaneaxial Fan -Axial fan with either inlet or discharge guide vanes or both. Includes fixed-pitch, adjustable-pitch, and variable-pitch impellers. Vaporization -The change of a substance from the liquid to a gaseous state.

One of the 3 basic contributing processes of air pollution, the others being attrition and combustion. Vapors -The gaseous form of substances which are normally in the solid or liquid state and which can be changed to these states, either by increasing the pressure or decreasing the temperature alone. Vapors diffuse. Variance -Permission granted for a limited time, under stated conditions, for a person or company to operate outside the limits prescribed in a regulation.

Usually granted to allow time for engineering and fabrication of abatement equipment to bring the operation into compliance. Velometer -A simple instrument for determining the velocity of gas in a duct, its operation is similar to an inclined manometer, except that it automatically converts the reading to velocity.

Vena Contracta -The smallest flow area for flow through a sharp-edged orifice. Ventilation -Supplying and removing air by natural or mechanical means to and from any space. Venturi -Device used to theoretically increase the efficiency of a compressed air pulse.

Designed with converging circular sides to a throat and then diverging sides. Designed such that when a pulse is introduced at the top, a negative pressure zone is created outside the top, and secondary air is induced into the venturi, increasing cleaning energy.

Venturi Scrubber -A wet type dust collector that can obtain very high efficiency, but requires large horsepower to do so. Vibration -Alternating mechanical motion of an elastic system, components of which are amplitude, frequency, and phase.

Viscosity -The characteristic of all fluids to resist flow. VOC's Volatile Organic Compounds -A group of chemicals that react in the atmosphere with nitrogen oxides in the presence of heat and sunlight to form ozone; does not include methane and other compounds determined by EPA to have negligible photochemical re-activity.

Examples of VOC's include gasoline fumes and oil-based paints. Volt -A unit of electrical potential or pressure. VP -Velocity pressure; the kinetic energy pressure of air in motion. VP is used to get the velocity of a gas stream.

W Y Yarn -A term for an assemblage of fibers or filaments forming a strand thread which can be otherwise formed into a textile material. Yarn Size -A relative measure of fineness or coarseness of yarn. The smaller the number in spun yarns, the coarser the yarn. Yield Strength -Maximum stress to which a ductile material can be subjected before it physically distorts. Z Z-Twist -The yarn spirals conform in slop to the center portion of the letter "Z. Fabric filtration is especially blessed with a full vocabulary.

Jargon associated with fabrics, can be nearly as arcane as any found in the Military's or Silicon Valley's lexicon. This section has been prepared to give you a basic understanding of the different filtration medias in the dust collection marketplace. Nonwoven -Nonwovens are defined by what they are not. Nonwoven is a generic term used to describe fabric that is produced differently from a fabric made by weaving or, more broadly, a fabric that is different from traditional woven or knitted fabrics.

Like all fabrics, nonwovens are planar structures that are relatively flat, flexible, and porous. Unlike traditional fabrics that re made by mechanically interlacing weaving or interlooping knitting yarns composed of fibers of filaments, nonwovens are fabrics that are made by: a mechanically, chemically, or thermally interlocking layers of networks or fibers or filaments or yarns, b interlocking fibers or filaments concurrent with their extrusion, c perforating films, or d forming porous films concurrent with their extrusion.

The American Society for Testing and Materials ASTM D defines a nonwoven fabric as: "A textile structure produced by bonding or interlocking of fibers, or both, accomplished by mechanical chemical, or solvent means and combinations thereof. Technologies used in three primary manufacturing industries: textile, paper, and extrusion and various combinations of established processes from one or more of these industries, form the basis of the processes for manufacturing nonwovens.

Accordingly, process for manufacturing nonwoven fabric can be grouped into four general technology bases: textile, paper, extrusion, or hybrid combination. The textile technology base includes garneting, carding and aerodynamic forming of textile fibers into preferentiallyoriented webs.

Fabrics produced by these systems are referred to as dry laid nonwovens and carry terms such as "garneted", "carded", and "air laid. Needle-felt fabric is produced by textile-based technology. Paper technology base includes dry laid pulp and modified wet laid paper systems designed to accommodate fibers longer than wood pulps. Fabric produced by these systems are referred to as "dry laid pulp" and "wet laid" nonwovens.

These fabrics are manufactured with machinery associated with pulp fiberizing i. Most cartridge filter media is produced by the wet laid systems. All wet laid cartridge paper contains high percentages of cellulose, reducing its resistance to moisture.

HEPA media is also produced on specialized, wet laid equipment. The extrusion technology base includes spunbound, meltblown, and porous film systems. Fabrics produced by these systems are referred to individually as "spun bounded", "meltblown", and "textured" or "apertured film" nonwovens; or, generically, as "polymer laid" nonwovens. The fabrics are produced with machinery associated with polymer extrusion i.

In polymer laid systems, fiber structures are simultaneously formed and manipulated. The hybrid base combine elements of the first three technologies. Acrylic is non-thermoplastic. For MAC Equipment applications, only acrylic homopolymer fabric should be used. Fiber cross sections are dumbbell-shaped, and surfaces are striated. Diameters are typically 15 to 35 microns. Where polyesters are not suitable, because of potential hydrolysis, acrylics offer a combination of abrasion resistance and resistance to wet heat degradation, particularly under acid conditions.

Homopolymer felt is a candidate for hot gas applications of less than degrees F. Acrylic felts are used in drying raw flour, coal, gold and copper ores, galvanizing, and low temperature flue gas applications. Polyester is superior for most dry heat applications.

In dry heat up to and including degrees F, this fabric may be used satisfactorily as long as there is no acid dew point problem.

However, it withstands these conditions better than many other fibers. It is unaffected by florines and gases from metallurgical and rock processing operations. Other uses include raw and finish mill grinding on cement plants, carbon bake, clinker coolers, and many other hot gas processes.

This material is a thermoplastic. Under moist, near-saturation, heat conditions, polyester is inferior to other synthetics. In the presence of a saturated vapor, the fibers will hydrolyze, weakening the fabric. PE provides good resistance to most oxidizing agents, mineral acids, and most organic solvents except high concentrations of sulfuric, carbolic and nitric acids.

It resists weak alkalis. However, strong alkalis, at high temperatures, will dissolve the fabric. Polyester fiber makes an excellent filter fabric, with efficient filtration and good energy absorption characteristics. The fabric is widely used in many of the industries served by MAC Equipment.

It is used in agricultural, woodworking, chemical and other applications where chemical and mechanical characteristics are compatible. As needled felt, it is available in 12, 16, and 18 oz. The use of 12 oz. The fibers combine excellent resistance to most acids and alkalis, plus high strength.

It has one of the lowest specific gravities of any synthetic fiber, and is one of the most economical synthetics, about the same price as polyester. PP is a good choice for replacement of cotton in low temperature applications.

PP absorbs no moisture and provides excellent cake discharge and resistance to blinding. Filtration efficiency is not quite as good as polyester. Polypropylene has very low heat resistance, even less than cotton, and should not be exposed to prolonged temperatures of over degrees F. Since it does not absorb moisture, its degradation characteristics in dry heat and moist heat are virtually the same. Within its limited temperature range, polypropylene provides good resistance to mineral and organic acids.

It resists alkalis, reducing agents and organic solvents. It is, however, soluble at degrees F in chlorinated hydrocarbons. P84 Polyimide -P84 is a proprietary fiber produced by Lenzing in Austria. Its fiber is highly convoluted, having a high surface area-todiameter ratio.

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