COLD STORAGE 99 
Doors: Special care should be exercised in securing 
tight-fitting doors with heavy flanges; they should also 
have the same degree of insulation as the other parts 
of the refrigerator. 
Forced Circulation of Air. To prevent dampness, 
mold and mustiness in cold storage rooms, circulation 
of air is absolutely essential. Usually a reasonable de- 
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FAN—— 
Fig. 36.—Showing Method of Forced Circulation. 
gree of circulation is secured without resorting to 
mechanical methods of forcing, but forced circulation 
will produce the best results and is recommended for all 
large refrigerators. The refrigerating coils should be 
in a room separate from the cold storage as shown in 
the accompanying illustration (Fig. 36) which also 
shows the method of producing forced circulation. A 
fan located at the floor of the refrigerating room, 
forces the refrigerated air into the cold storage rooms, 
causing the warm air of the latter to escape through an 
