Terminology and Resources

Fan and Blower Related Associations

Air Movement and Control Association (AMCA) International, Inc.
Phone: 847-394-0150
Provides information on air systems and equipment, including industrial fans, and provides a Certified Ratings Program for equipment.

Home Ventilation Institute (HVI)

Phone: 847-526-2010
Represents manufacturers and distributors of industrial fans, blowers and related equipment.

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)
Phone: 800-527-4723
Professional organization providing information on ventilation, heating, refrigerating and air-conditioning systems

Fan and Blower Resource Magazines


ACH & R News

Fan and Blower Terms

Air Changes or Exchanges - 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 or Shutter - 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.

FPM - Abbreviation for feet per minute.

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.

Heater Related Associations

Industrial Heating Equipment Association (IHEA)
Phone: 513-231-5613
Enhances member company capabilities to serve end users in the industrial heat processing industry.

National Electrical Manufacturers Association (NEMA)
Phone: 703-840-3200
A forum for the standardization of electrical equipment.

International Thermoelectric Society (ITS)
Dedicated to the advancement of thermoelectric industry, science and technology.

International Organization for Standardization (ISO)
Phone: +41 22 749 01 11
A network of the national standards institutes from 148 countries.

Heater Resource Magazines

Industrial Heating

Process Heating

HPAC Engineering


"Guide For Heat Losses"

"Cartridge/Superwatt Heaters"

Heater Terms

Amps - The meter-kilogram-second unit of electric current that is equivalent to the steady current produced by one volt applied across a resistance of one ohm.

British Thermal Unit (BTU) - Used for measuring a quantity of heat. One BTU is the quantity of heat necessary to raise the temperature of 1 pound of water 1°F.

Celsius - The metric temperature scale in which water freezes at zero degrees and boils at 100 degrees, designated by the symbol "C".

Circuit - An electrical device providing a trail for electrical current to flow.

Duct - An enclosure in which air is moved that is primarily constructed from sheet metal.

Fahrenheit - The heat scale on which water freezes at 32 degrees and boils at 212 degrees, abbreviated by the letter F.

Fan - A device that creates currents of air, sometimes built in electric heaters to push air out from the unit.

Heating Coil - Any coiled element that serves as the source of heat.

Heating Element - The component of the heater which is responsible for conducting the heat.

Hertz - In alternating current (AC electricity), the number of cycles per second, denoted hz.

Peltier Modules - Jean Peltier in 1834, discovered that passing an electric current through the junction of two different conductors cools or heats the junction depending on the direction of the current. The modern Peltier modules are made out of semiconductor material, and are used in thermoelectric devices.

Radiationange - The distribution of energy by electromagnetic waves, of a generally long wave-length.

Sensor - Any device that reacts to a change in the environment being measured, by signaling of the change via audible or visual means.

Therm - A measurement of heat equal to 100,000 btu.

Thermocouple - Measures the difference in potential created at the junction of two different metal wires, which feed from the measuring instrument. (http://www.thermocouple-assemblies.com)

Thermostat - An automated device for controlling temperature.

Thyristor - A power semiconductor device with three terminals called the gate, cathode and anode. Its state becomes conductive (ON) or blocking (OFF) depending on the behavior of these terminals.

Volts - The difference of possibility between two points in a conducting wire with a constant current of one ampere.

Watts - The meter-kilogram-second unit of power equal to the power produced by a current of one amp.