"This Canarm Fan Hood with Bird Screen helps protect your intake/exhaust fan from rain, snow, birds and other small animals. Accessory Type Weather hood, Material Type Galvanized metal, Dimensions L x H in. 19 1/2 x 20 1/2, Dimensions L x W x H in. 19 1/2 x 19 1/2 x 20 1/2. 18-gauge galvanized metal construction Inside dimensions 16.5in.W x 16.5in.H"
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