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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.
[13] [3] The black painted wall is constructed of approximately 2 foot thick concrete with an air space and a double glazing on its exterior side. The house is primarily heated by radiation and convection from the inner surface of the concrete wall and the results from studies show that 70% of this building's yearly heating needs are supplied ...
The 1 inch insulation glass is typically made up of two 1/4-inch lites of glass with a 1 ⁄ 2 inch (13 mm) airspace. The air inside is usually atmospheric air, but some inert gases, such as argon or krypton, may be used in order to offer better thermal transmittance values. In Europe, triple-pane insulating glass infill is now common.
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The window panes are 7 feet 2 inches (2.18 m) tall, with the sill being 30 inches (760 mm) above the top of each floor slab, thereby concealing air-conditioning units beneath each window. [49] The mullions are nearly flush with the glass, projecting about 1 inch (25 mm) from the outer surface of the glass panels. [ 49 ]
Heated building volume V. At 50·Pa, it is called the air change rate at 50 Pa and usually noted n 50 (units: h −1). [13] [14] Envelope area A E. At 50 Pa, it is called the air permeability at 50 Pa and noted usually q 50 or q a50 (units: m 3 /(h·m 2)) [13] [14] Floor area A F.
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