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Glossary & Acronyms
1.
ASHRAE—American Society of Heating, Refrigerating, and Air Conditioning Engineers
2.
Air Handler/ AHU—The Furnace or air conditioner that heats, cools and moves the air.
3.
Antimicrobial—Agent added to materials to retard growth of biological contaminants.
4.
Arrestance – An ASHRAE standard procedure to measure air filter efficiency (52.1)
5.
CFM—Cubic Feet per Minute, a measure of how much air is flowing in an air system.
6.
Ceiling Plenum – The area above a suspended ceiling that may be used as a return path to the
Air Handler.
7.
Conditioned Air – The air that has been filtered heated or cooled by the air handler.
8.
Dampers – Flaps or valves in the air duct that control the amount of airflow in the duct.
9.
Diffusers & Grilles & Registers – The covers at the end of supply and return ducts that
control the amount and direction of the air-conditioned air entering or leaving a room.
10.
Electrostatic Filter – A High Efficiency (95% Arrestance) Air filter that generate static
electricity from the air movement through the air handler and captures dust from the air while
the clean air move freely through it.
11.
Duct – A metal, plastic or fiberglass tube that transports air to and from the Air Handler.
They can be round, square or rectangular.
12.
Duct Board – Compressed fiberglass material used to make air ducts, particularly in the
southern U.S.
13.
Fiberglass Filter – A disposable, very low efficiency filter (approx. 10% arrestance).
14.
Flex duct – Plastic fabric duct with a spiral wire support. It us used extensively in the
Western U.S.
15.
HEPA—High Efficiency Particulate Air, A rating for filters used in critical applications.
16.
HVAC—Heating, ventilation and air-conditioning
17.
Hybrid – Combining Two types of power sources to perform a single task.
18.
Inverter—Electronic device that changes AC current to DC current, increase its voltage and
change it 3-Phase AC Power at varying frequency to control motor speed. Also called VFD.
19.
MERV- Minimum Efficiency Rated Value, An ASHRAE residential filter rating system
(52.2)
20.
MSDS—Material Safety Data Sheet
21.
Make-up Air – Fresh “outside” air that is brought into a Commercial building.
22.
NADCA-- National Air Duct Cleaners Association
23.
NAFA – National Air Filter Association
24.
NSF International – An independent testing laboratory for Air filters
25.
OSHA—Occupational Safety and Health Administration
26.
Re-entrainment – The flow of dust and debris removed from an air system back into the same
building
27.
Return/Return Duct – Duct that Pulls air from the conditioned are to be filtered, heated or
cooled.
28.
Sanitizer – A material designed to kill mold, bacteria, and viruses.
29.
Supply/ Supply Duct—The opening and related ductwork that delivers conditioned air to a
room.
30.
VAV—Variable air volume system – A system that varies the amount of flow of air to
regulate temperature.
31.
VFD – Variable Frequency Drive. An electronic speed controller for 3-phase motors.
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