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) Convenient Size: 3/4" width x

Convenient Size: 3/4" width x 85' length provides ample material for various projects

75" with screw holes distance between 10

actual overall outside dimension is 18

guaranteeing that it arrives at your home in perfect condition

this is the right size and will fit in well

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) Convenient Size: 3/4" width xThe 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