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A typical commercial air curtain enclosure. In North America, the more commonly-used term for an air door is "air curtain". The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) defines an air door as follows: "In its simplest application, an air curtain is a continuous broad stream of air circulated across a doorway of a conditioned space.
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The curtain wall itself, however, is not ordinarily required to have a rating. This causes a quandary as compartmentalization (fire protection) is typically based upon closed compartments to avoid fire and smoke migrations beyond each engaged compartment. A curtain wall by its very nature prevents the completion of the compartment (or envelope).
There are nine Fortune 500 companies headquartered in the Pittsburgh metropolitan area. [1] 120 PNC Financial Services (financial) 220 PPG Industries (industrial) 226 Howmet Aerospace (industrial) 245 Wesco International (industrial) 254 Viatris (pharmaceuticals) 310 U.S. Steel (industrial) 330 Alcoa (metals/mining) 362 Dick's Sporting Goods ...
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Air curtain may refer to: Air door, a fan-powered device used for separating two spaces from each other; Pneumatic barrier for containing oil spills; See also.
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