Fits 20x20 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 21.75"W X 21.75"H (20" W x 20" H Duct Opening) 75" with screw holes distance

75" with screw holes distance between 10

The Listed size 20"x6" is for inside duct opening measurement

Measure the size of the air duct opening(the size of the “hole” )

One Way Air Flow deflection Design

Independent cardboard packing for extra protection

Fits 20x20 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 21.75"W X 21.75"H (20" W x 20" H Duct Opening) 75" with screw holes distanceThe Listed size 20"x20" is for inside duct opening measurement, actual outside dimension is 21. 75"x21. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow applications. Screws are included for easy installation White Powder coating with matte finish Individually packed with cardboard box for ultra protection