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air door
An air door or air curtain is a device used to prevent air or contaminants from moving from one open space to another. The most common use is a downward-facing blower fan mounted over an entrance to a building, or an opening between two spaces conditioned at different temperatures.
Air doors can come with or without heaters to heat the air. The fan must be powerful enough to generate a jet of air that can reach the floor. There are some studies in the scientific literature that present analytical methods to predict the sealing efficiency obtained with an air curtain.〔Taken from (H.Giraldez, Improved Semianalitycal method for air curtains prediction. Energy and Buildings ) November, 2013.〕
==Definitions==
American Society of Heating, Refrigerating and Air-Conditioning Engineers defines an air door as: "In its simplest application, an air curtain is a continuous broad stream of air circulated across a doorway of a conditioned space. It reduces penetration of insects and unconditioned air into a conditioned space by forcing an air stream over the entire entrance. The air stream layer moves with a velocity and angle such that any air that tries to penetrate the curtain is entrained. Air curtain effectiveness in penetrating infiltration through an entrance generally ranges from 60 to 80%".〔Taken from the ASHRAE Handbook 2004: HVAC Systems and Equipment, page 17.9〕
Air Movement and Control Association defines an Air Curtain as: "A directionally-controlled airstream, moving across the entire height and width of an opening, which reduces the infiltration or transfer of air from one side of the opening to the other and/or inhibits flying insects, dust or debris from passing through".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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