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) buy a 16x25 grille

buy a 16x25 grille

guaranteeing that it arrives at your home in perfect condition

actual overall outside dimension is 18

this is the right size and will fit in well

One Way Air Flow deflection Design

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) buy a 16x25 grilleThe 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