For roof or gable mount. Heavy-duty screen deters animals and insects. Large pre-punched flashing for easier installation and less chance of leaks. 14 attic air exchanges per hour. SKU: 41803532 MFG: PR1DBL Shop more products by L L Building Products. SHARE Share on Facebook Tweet on Twitter Share on Google+ Pin on Pinterest Shipping charges calculated at checkout. Sold out $105.51 Quantity Sold Out Sold out Request a Bulk Quote Thank you for your quote request. We will be in touch. DETAILS Description DESCRIPTION Highlights: Color: Black 14" blade diameter. For roof or gable mount. Flashing size 21" x 22-1/4" 14 attic air exchanges per hour. Rust resistant metal construction. Automatic adjustable thermostat included. Heavy-duty screen deters animals and insects. Large pre-punched flashing for easier installation and less chance of leaks. Air flow of 1000 CFM (Cubic Feet Per Minute) for attics up to 1,600 sq. ft. for optimal perfomance. FEATURES MFR: PR1DBL SKU: 41803532 UPC: 050206778548 Brand: L L Building Products