20x20 Return Air Grille(Duct Opening Size),Air Return Vent Cover,Flat Vent Cover,Rejillas De Aire Acondicionado para Casa,Return Air Grilles,Outer Dimensions:21.75"Wx21.75"H(20"Wx20"H, Duct Opening) TITO Details: Buyers Products E-Track Ladder

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20x20 Return Air Grille(Duct Opening Size),Air Return Vent Cover,Flat Vent Cover,Rejillas De Aire Acondicionado para Casa,Return Air Grilles,Outer Dimensions:21.75"Wx21.75"H(20"Wx20"H, Duct Opening) TITO Details: Buyers Products E-Track LadderHow to Measure: Always measure the wall opening to determine which size you should order. Wall Opening Size(20"W x 20"H) = Listed Size(20"W x 20"H, Duct Opening). 20"W x 20"H is the size for the duct opening measurement only, actual return air grille outer dimensions are 21. 75"W x 21. 75"H. ATTENTION: This is a flat return air grill used for mounting on the wall directly (Screws included) High Quality Materials: Embodying a powder coated finish, the