24" X 24" Return Air Filter Grille - Filter Included - Easy Plastic Tabs for Removable Face/Door Insulated Line Set + Product Details Size –

+ Product Details Size – 24"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 38 5/8" height -

Designed for optimal air flow and lasting durability

actual front end outer dimensions are approximately 16 5/8" width X 16 5/8" height

+ Product Details Size - 20"w X 10"h is the size for the duct opening measurement only

24" X 24" Return Air Filter Grille - Filter Included - Easy Plastic Tabs for Removable Face/Door Insulated Line Set + Product Details Size –+ Product Details Size 24"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 75" width X 25. 75" height Actual Filter Size 23 3 4"w x 23 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.