10 Cobra Rigid Vent 3 Exhaust Vent for Roof Ridge allows heat and moisture to escape at the ridge. It provides 18 sq. inches per linear foot (67,720 m2/lm) of net free ventilating area, and its unique EasyTear Sizing feature allows you to hand-tear the product in 3" (76 mm) increments - no knives necessary and less waste!. Ventilates for energy efficiency & fights roof system degradation. 11.5 width for use with 12 width ridge cap shingles. Includes 3 ring shank nails for proper fastening. Cap Shingle Compatible: 12" Wide. Color Family: Black. Color/Finish: Black. Features: Corrosion Resistant,UV Resistant. Intake/Exhaust: Intake/Exhaust. Material: Plastic. Mounting Position: Roof Mount. Power Type: Non-Powered. Product Weight (lb.): 2.7 lb. Net-Free Area (Sq. In.): 18. Product Depth (in.): 48 in. Product Height (in.): 0.875 in. Product Width (in.): 13.7 in.