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 space conditioned at different temperatures. Air doors can come with or without heaters to heat the air. The fan...
Found on
http://en.wikipedia.org/wiki/Air_door
Airtight wooden framed doors covered in 'Braddish' (Brattice) usually arranged in pairs to control the airflow between the 'main' and 'return'. A person or persons would enter between the doors closing the first door behind them before opening the second. In the early days a young or very young boy would be employed to open and shut these doors to ...
Found on
http://www.welshcoalmines.co.uk/Glossary.htm
No exact match found.
