24" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 26 5/8" X 32 5/8"] w25h25 + Product Details Size -

+ Product Details Size - 12"w X 24"h is the size for the duct opening measurement only

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Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

which the interior PET provides

actual front end outer dimensions are approximately 34 5/8" width X 14 5/8" height

24" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 26 5/8" X 32 5/8"] w25h25 + Product Details Size -+ Product Details Size 24"w X 30"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 26 5 8" width X 32 5 8" height Actual Filter Size 23 3 4"w x 29 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.