Black, Square Vent, Galvanized Top, 38 SQIN Net Free Vent Area, Prolong The Life Of Your Roof With Economical, Fast & Easy To Install Galvanized Roof Vents, 8" Opening With Aluminum Screen, Engineered For More Efficient Ventilation & Less Labor For The Money, Saves Energy & Reduces Heat & Moisture Damage, Ideal For Kitchen Or Bathroom Exhaust Caps On The Roof, Slant Back Design Helps Divert Rain, Snow & Debris Away From Vent Opening.