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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| face area |
total plane area of the portion of a grille,
coil, or other item bounded by a line tangent to the outer edges of the
openings through which air can pass |
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| failsafe |
1.
position or mode of operation a controlled device takes on removal of the
control signal and/or power. 2. verb.
to return to a position that, on loss of control system power, allows the
controlled system to exist in a safe manner |
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| failure response | maintenance department resources expended or
reserved for dealing with interruptions in the operation or function of a system
or equipment under the maintenance program. This response has two types of
classification: repair and service. |
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| false ceiling (intermediate ceiling) | ceiling panel supported below the structural
ceiling, so the space between may be used for the circulation or distribution
of air. Compare suspended ceiling |
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| false floor | secondary floor installed above the original
floor, so the space between may be used in air conditioning for the
circulation, distribution, or reentry of circulating air. Compare false ceiling |
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| fan | device for moving air by two or more blades or
vanes attached to a rotating shaft. See also impeller |
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| fan air density | density of air corresponding to the total
pressure and total temperature at the fan inlet, when the fan is operating |
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| fan appurtenances | accessories added to a fan for purposes of
control, isolation, safety, static pressure regain, wear, etc. Such
appurtenances include inlet boxes, inlet box dampers, variable inlet vanes,
outlet dampers, vibration isolation bases, inlet screens, belt guards,
diffusers, sound attenuators, wear protection, turning gears, etc. |
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| fan blast area | fan scroll outlet area less the area of the
cutoff |
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| fan boundary (inlet and outlet) |
interface between the fan and the remainder of
the system, at a plane perpendicular to the airstream where it enters or leaves
the fan. Appurtenances such as inlet boxes, inlet vanes, inlet cones,
silencers, screens, rain hoods, dampers, and discharge cones may be included as
part of the fan between the inlet and outlet boundaries. |
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