20" x 20" Return Air Grille Can/Box. Metal Sides Duckboard Insulated Inside.

Description

Return Air Grille Box to go with grille. makes it easy to install Return Air Grille. Simply install it inside the cavity created in the sheet rock and it fits right in. It is sized for your return air grille and duckboard back provides easy way to cut out return flex duct whole. Use a collar and foil tape and air lock mastic to seal it.