Gable louvers help provide attic ventilation to exhaust unwanted heat and moisture which can damage wood or roofing materials. A balanced ventilation system (50% intake ventilation combined with 50% exhaust ventilation) can also lower utility bills. Conforms to Federal Specification QQ-5775A, Type 1, Class 4 ASTM A-653- meets FHA codes. 28-Gauge galvanized steel, 1-piece construction with a 2 in. thick frame. 1/4 in. Galvanized wire mesh prevents entry from birds or large insects. Net free area: 147 square inch Durable polyester paint finish Rough opening 14-1/4 inch x 24-1/4 inch Front nailing flange for remodel or siding applications 1/8 inch galvanized wire mesh to keep out birds and insects Color/Finish Family: White Manufacturer Color/Finish: White Height (Inches): 24.0 Rough Opening Length (Inches): 24.25 Rough Opening Width (Inches): 14.25 Weight (lbs.): 5.07 Width (Inches): 14 Material: Steel Package Quantity: 1 Paintable: Yes Screen Included: Yes Shape: Rectangle Warranty: None CA Residents: Prop 65 Warning(s): Yes UNSPSC: 40101500