Classic design and function for venting air through side walls, durable, maintenance-free, UV stabilized and constructed with color molded-through so they wont scratch, flake or fade, built-in concealed exhaust flap stays closed when not in use, net free area 25 sq-in, locking positions 3/4, 1 and 1-1/4 in, fitted with 6 in exhaust pipe and pipe length 8-1/10 in, wire screen included. Lifetime limited warranty. Made in USA.