"This Canarm Fan Hood with Bird Screen helps protect your AX exhaust fan from rain, snow, birds and other pests. Accessory Type Weather hood, Compatible With Item Number s 13749, Material Type Galvanized metal, Dimensions L x H in. 19 x 20, Dimensions L x W x H in. 19 x 19 x 20. Bird screen Galvanized metal construction Inside dimensions 16.1in.W x 16.1in.H Fits Canarm AX14-4 shutter-mounted fan"
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