Development in entrance protection eliminates mechanical doors, except for night service or emergency, and allows constant accident free flow of pedestrian or rolling traffic; hermetically sealed entrance is said to be practical for buildings where heavy traffic exists; industrial uses such as sealing freezer rooms having below zero F on inside or 60 to 100 F on outside and separating spaces with different temperatures.
Entrances are sealed behind air curtain
Refrig Eng
Refrigerating Engineering ; 64 , n 4
1956
Article (Journal)
English
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Engineering Index Backfile | 1953
|Engineering Index Backfile | 1954
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