Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| air gas ratio | ratio of the air volume to the gas volume. A specified
ratio is necessary to achieve a desired character of combustion
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| air handling unit | device, usually connected to ductwork, to move
air, which also may clean and condition the air. See also ventilator
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| air heater, forced convection (unit heat | assembly of a heating element and a distribution
fan
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| air horsepower | {mospagebreak} air power expressed in horsepower
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| air infiltration (building) | uncontrolled inward leakage of air (that may
contain entrained water vapor) through cracks and interstices in any building
element and around windows and doors of a building, caused by the pressure
effects of wind or the effect of differences in the indoor and outdoor air
density. See also specific infiltration
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| air inlet | device or opening through which air is withdrawn
from or discharged into a conditioned space (grilles, registers, diffusers, and
slots may be used as air inlets). See also air supply fixtures
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| air inlet core area | total plane area of the portion of a grille, face,
or register bounded by a line tangent to the outer edges of the outer openings
through which air can pass
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| air inlet free area |
1.
total area through which air can pass in a grille face or register.
2.
actual open area between the fins of a grille or register.
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| air lock | compartment whose purpose is to control air exchange
into or out of a conditioned space. Two individual closures usually are used to
restrict air transfer by keeping one of them closed
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| air main |
1.
supply line from air compressor or central pressure-reducing station to branch
feeder in a pneumatic control installation.
2.
tube carrying the supply of compressed air to the components of a pneumatic
control system. 3. pipe carrying air to the laterals supplying
ice cans contained in a freezing tank
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