The semi-permanent, semi-continuous front between the deep, cold arctic air and the shallower, generally less cold polar air of northern latitudes; generally comparable to the ANTARCTIC FRONT of the Southern Hemisphere.

Related Terms

PUMP SHROUD

The front and/or back of an impeller.

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.

EMULSIFIER

Additive that promotes the formation of a stable mixture, or emulsion, of oil and water. Common emulsifiers are: metallic soaps, certain animal and vegetable oils, and various polar compounds.

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.

ACTIVATED CARBON

Is a specially processed carbon, used as a filter drier. Commonly used to clean air.

AIR REHEATING

In an air conditioning system, the final step in treatment, in the event the temperature is too low.

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