20" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 22 5/8" X 18 5/8"] Adjustable Return display = 'none' Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

display = 'none'

+ Product Details Size - 25"w X 25"h is the size for the duct opening measurement only

making it ideal for preventing tampering or unauthorized adjustments

+Product Details Size – 2"h x 12"w is the size for the duct opening measurement only

+ Product Details Size – 24" x 24" with 14" collar T-Bar drop ceiling perforated return grill - metal back casing

20" X 16" Steel Return Air Filter Grille for 1" Filter Removable Frame * Filter Included * [Outer Dimensions: 22 5 8" X 18 5 8"] Adjustable Return display = 'none' Compatible With Duct 7in Applications This sheet metal DDAG A 1212 display = 'none' + Product Details Size 25"w X 25"h is the size for the duct opening measurement only