A severe weather condition characterized by low temperatures and by strong winds bearing a great amount of snow (mostly fine, dry snow picked up from the ground). The National Weather Service specifies the following conditions for a blizzard: a wind of 32 miles per hour or higher, low temperatures, and sufficient snow in the air to reduce visibility to less than 500 feet; for a severe blizzard, it specifies wind speeds exceeding 4

Related Terms

ABSORBER

That part of the low side of an absorption system, used for absorbing vapor refrigerant.

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.

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.

ABSOLUTE HUMIDITY

Amount of moisture in the air, indicated in kg/kg of dry air.

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