Roof louvers are a type of attic exhaust vent that make up half of a balanced attic ventilation system for each roof. Intake vents make up the other half of the system. Together they help remove any built-up heat and moisture inside the attic for year-round ventilation. Use the Lowe's calculator to determine how many individual roof louvers are needed per roof. One-piece design for additional strength and weather protection with Miami - Dade county approved 50 Square inches of Net Free Area airflow each Aluminum construction Slant-back design Suitable for 3/12 to 12/12 roof pitch Part of a balanced attic ventilation system for year-round airflow Helps to fight heat and moisture buildup inside an attic as well as ice dams in cold climates Requires intake ventilation for proper performance Use the Lowe's online calculator to determine how many are needed for each attic Color/Finish Family: Black Manufacturer Color/Finish: Black Type: Slant-back Height (Inches): 3.625 Length (Inches): 16.0 Rough Opening Length (Inches): 8.0 Rough Opening Width (Inches): 8.0 Weight (lbs.): 1.75 Width (Inches): 15.0 Damper Included: No Material: Aluminum Net Free Area (Sq. Inches): 50.0 Rain Diverter Included: No Screen Included: No Warranty: 5-year limited CA Residents: Prop 65 Warning(s): Yes UNSPSC: 30151600