30" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 32 5/8" X 22 5/8"] w20h20 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 8"w X 16"h is the size for the duct opening measurement only

Design – Fixed hinged for easy filter change & cleaning - uses a 1" thick filter

actual front end outer dimensions are approximately 22 5/8" width X 14 5/8" height

Insulation density is 30kgs/cbm = 0

+ Product Description Enhance your ventilation system with our high-quality grilles and registers

30" X 20" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 32 5 8" X 22 5 8"] w20h20 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 8"w X 16"h is the size for the duct opening measurement only Design – Fixed hinged for easy filter change & cleaning uses a 1" thick filter