The Master Flow black aluminum slant back roof louver is designed for attic ventilation. The fully enclosed hood deters rodent and insect infiltration and leaf and pine needle clogging. The aluminum slant back roof louver is an excellent choice against weather infiltration, especially in steep-slope applications. Each vent offers a full 60 sq. in. of net free ventilating area (NFA). Its aluminum is 1/32" thick. Its rectangular aluminum base is 16" wide by 20 1/2" long. Its aluminum hood dimensions are 11 1/2" wide by 15 1/4" long. Its overall height is 5 1/2". It is protected by a limited lifetime warranty by the manufacturer.