For ductless installations and mobile homes. Diffuses air 4 ways or 6 ways with 14 adjustable louvers, made with white colored, high-impact plastic. Will not rust, corrode or stain. For duct openings up to 20 in x 20 in. Grille is 22-1/2 in x 22-1/2 in x 3-1/8 in depth. Easy to install. For all residential cooler models.