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| Air conditioning
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The control of the quality, quantity, and temperature-humidity of the air in an interior space. |
| Air content
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Volume of air in concrete, cement or mortar. Air Cooled Reduction in the temperature, which is caused by the transfer of heat to air as it circulates. |
| Air cooled cooling system condenser
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Finned, tube-type condenser through whose tubes a refrigerant is circulated, giving heat to air passing over the outside of the finned tubes, cooling the refrigerant. |
| Air cooler
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Mechanism designed to lower temperature of air passing through it. |
| Air core solenoid
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Solenoid that has a hollow core instead of a solid core. |
| Air cushion tank
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An expansion tank. Closed tank in a hot water system providing space for the water expansion in the system as it is heated. Tank contains both water and air and as the water expands, the air in the tank is compressed. |
| Air diffuser
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An air distribution outlet or grille designed to direct airflow into desired patterns. Supply air terminal device, designed to direct airflow into desired patterns, usually placed in the ceiling, generally of circular, square or rectangular shape, and composed of divergent deflecting members. |
| Air diffusion
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Distribution of the air in a space, called the treated space, by means of devices, called air terminal devices, in a manner so as to meet certain specified conditions, such as air change rate, pressure, cleanliness, temperature, humidity, air velocity and noise level. |
| Air distribution
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The transportation of a specified air flow to or from the treated space or spaces, generally by means of ductwork. |
| Air dried lumber
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Lumber that is dried by being exposed to natural air rather than with the aid of heating devices. |
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