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Industrial Blower Terms

Air Changes – The amount of time, expressed in minutes, that is takes for a fan system to replace air in an area.

Air Distribution – The delivery of outdoor or conditioned air to various spaces in a building, usually by mechanical means.

Air Velocity – The rate and direction of air movement.

CFM – Abbreviation for cubic feet per minute; a measurement of the amount of air a fan or blower moves through ventilation and circulation during operation.

Circulation – The process of a fan moving air around within a specific area.
 
Cross Ventilation – Air that enters on one side of a room and leaves on a different side of the same room.
 
Damper – The mechanism responsible for the regulation of airflow in a fan system; dampers consist of inlet dampers, which regulate airflow into the system, and outlet dampers, which control air movement out of the system.
 
Fan Blade – The fan component extending from the hub that rotates, cutting into the air and producing air movement. Fan blades may stick straight out in a radial position, curve forward in the direction of fan wheel rotation or curve backward.
 
Fan Drive – The fan mechanism responsible for controlling the movement of the fan wheel, including fan wheel speed.
 
Fan Wheel – Fan component consisting of a hub and blades, which rotate about the wheel in order to produce air movement.
 
Hub – The point on an industrial fan wheel from which the fan blades extend.
 
Multizone – A building or part of a building that comprises a number of zones or cells.
 
Static Pressure – The amount of resistance in a circulation or ventilation system that a fan must surmount to ensure proper air movement.
 
Total Pressure – The total amount of pressure, measured in Pascals, that an industrial fan or blower produces, including both the static pressure and the velocity pressure.
 
Velocity – The rapidity of air movement in a ventilation system, measured in feet per minute (fpm).
 
Velocity Pressure – The amount of pressure in a circulation or ventilation system resulting from air movement.
 
Ventilation – The fan process in which air is moved into, out of and between different areas. Ventilation is used to replace old, stale, odiferous or contaminated air with fresher, cleaner air.