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ABRASION RESISTANCE
Ability of a fiber or fabric to withstand surface wear.

ABRASION - FLEX
Fabric weakness created by repeated fiber bending.

ABRASION - SURFACE
Fabric wear on the surface created by particulate erosion, rubbing or scuffing.

ACIDITY
The quantitative capacity of aqueous solutions to react with alkalis.

ACID DEW POINT
The temperature at which liquid droplets which are acidic condense from the vapor phase.

ACID GAS SCRUBBER
Process equipment where an alkaline solution is introduced into the gas stream in a finely atomized spray. It reacts with gas stream constituents to be scrubbed, creating neutralized particles that have absorbed acids and can be collected.

ACFM
Actual Cubic Feet per Minute. The volume of the gas flowing per minute at the operating temperature, pressure and composition.

ACRYLIC
Any of a group of synthetic fibers derived from a compound of hydrogen, cyanide, and acetylene, and made into fabrics.

AFFLUENT
Fluid entering the filter or filter system. Commonly described as influent, it is the opposite of effluent.

AGGLOMERATION, PARTICLE
Multiple particles joining or clustering together by surface tension to form larger particles, usually held by moisture, static charge or particle architecture.

AIR HEATER
A heat exchanger which transfers heat otherwise wasted from the flue gases to the incoming furnace air.

AIR-TO-CLOTH RATIO
The ratio between ACFM flowing through a filter and the square feet of filter area available. This can also be thought of as the velocity of the gas passing through the filter in feet per minute (FPM). Note: In the metric system the term used is "filtration velocity" (instead of "air to cloth ratio"; defined as the relation between the m3/min. of air flowing through a filter and the m2 of filter area available.

ALKALINITY
The quantitative capacity of aqueous solutions to react with acids.

ANEMOMETER
A device for measuring small air velocities. See hot-wire anemometer and rotating vane anemometer.

ANTI-COLLASPE RINGS
Small diameter metal rings that surround a reverse air bag. They are kept in place by an outer covering of fabric that is sewn to the bag. These prevent flattening (sometimes termed pancaking) of the bag during cleaning.

ANTI-SNEAK BAFFLES
A gas distribution device in which internal baffle elements within the precipitator prevent the gas from bypassing the active field or causing hopper re-entrainment.

APPROACH VELOCITY
The inlet (unfiltered) gas stream velocity as it passes around the bottoms of the filter elements to approach the filter media surfaces in pulse jet and cartridge filtration systems. The approach velocity is determined by the air-to-cloth ratio, the filter element spacing, and the filter element height. Also referred to as can velocity.

ATMOSPHERIC PRESSURE
The pressure of approxinmately 14.7 pounds per square inch (psi) exerted at sea level in all directions by the atmosphere.