Thermopan 24" x 6" Filtered Return Air Grill Wall Frame, for Clean Air Flow

Product Features Add Quality To Your Jobs! Precision Molded Polypropylene...No Product Loss On Truck Or On The Job Site. Safety Edged... All Sides And Ends. Double Frames Can Be Cut For Use As A Single. Place Grille Over Frame And Screw Into Precision Molded Frame Holes On Finished Drywall.