It allows you to beat the heat by forcing hot air out of your home through your attic space while bringing in cooler outside air through your windows and doors. This unit comes with a white shutter and features a low-vibration, direct drive mechanism for reliable performance. Of attic space with a minimum of 1008 sq. Of net free area attic exhaust is required for proper operation.Cut-Out Width (in): 27.25 in. Net-Free Area (Sq In): 1008. Product Depth (in): 31.5. Product Width (in): 30.5. 24 Direct Drive Whole House Fan With Automatic Shutter. Pulls Air From A House Size Of 1500 SQFT, 4500 CFM. 110v, Runs On High & Low, 2 Speed Pull Chain Included. Needs 864 SQIN Of Open Exhaust Vents In Attic Space. Rough Opening Is 27-3/4" x 29". Do Not Have To Cut Joist When Installing Fan For Easier Installation. Thank you for looking this is a "Pick-up Only" item. Location near Santa Monica Ca High School. This item is in the category "Home & Garden\Home Improvement\Heating, Cooling & Air\Indoor Air Quality & Fans\Exhaust Fans & Ventilators". The seller is "214bob" and is located in this country: US. This item can be shipped to United States.