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Mechanically driven fans used to either blow air into the furnace through the windbox or to draw the combustion gases from the boiler and expel them out the stack.

Related Terms

ABMA

American Boiler Manufacturers Association.

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

AIR INFILTRATION

The leakage of air into a room through cracks in doors, windows, and other openings.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

CAM

Eccentric shaft used in most internal combustion engines to open and close valves.

OUTDOOR AIR

Air taken from outdoors and, therefore, not previously circulated through the system.

SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.

AIR

A substance containing by volume approximately 78 - 79% nitrogen; 20.95% oxygen, 0.94% argon, traces of carbon dioxide, helium, etc.
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