40 X 20 (Duct Opening Size) Air Return Filter Grille Steel Bar Face (Color-White) Bar Style Return Filter Frame 40X20 Stylish grille for ceiling return air. Face opens on hinges to allow filter access. Vanes are fixed individually. Steel construction. Color-White. Built in lever style latches close firmly, no knobs to lose. Covers 40" x 20" opening. Holds 2 20x20 filters. Register face is 41-3/4" x 21-3/4".