Air curtain
From wikiMHEDA
An air curtain, also known as an "air door," is an air moving device which produces a directionally-controlled curtain of air that moves across the entire height and width of an opening. This barrier of air reduces the infiltration of air or transfer of air from one side of the opening to the other and/or inhibits flying insects, dust or debris from passing through.[1]
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Types of Air Curtains
Recirculating Air Curtains
Recirculating air curtains emit air from a discharge grille on one side of the door opening, collect it through a receiving grille on the opposite side, and return it through ductwork to the discharge grille.
Non-Recirculating Air Curtain
Non-recirculating air curtains pull air into the unit through the intake. The air enters the fan housing and is accelerated by the fan. This fast moving air goes into a plenum, which allows for an even distribution of air along the full length of the discharge nozzle. Aerofoil shaped vanes in the nozzle create a uniform air stream with a minimum amount of turbulence.
The proper size, power rating, and features needed for a particular air curtain application should be selected according to the following considerations:
- The physical dimensions of the opening, including height, width, and space available for installation.
- The type of door being used.
- Type of Opening – customer entry, service entry, dock door etc.
- The need for a heated air door to create a comfortable environment
- Prevailing winds and temperatures on outside openings.
- The existence of any drafts due to pressure differences at the opening.[2]
Air Curtain Benefits Include
- Year Round Energy Savings - providing a thermal barrier that stops drafts and reduces infiltration of outdoor air into heated or air conditioned areas. Cold drafts are minimized in the winter and hot, humid air is kept out during the summer.
- Improved Working Environment - designed to prevent either cold or heat from entering the building at door openings, protecting employees and customers.
- Increased Safety - allows clear, unabstructed, easy access through door openings.
