18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 20 5/8" X 14 5/8"] w6h6 allow you to customize airflow

allow you to customize airflow direction with ease

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+ Product Description Secure your thermostat with the heavy-duty Beige Metal Thermostat Guard

+ Product Details Size - 10"w X 4"h is the size for the duct opening measurement only

18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 20 5/8" X 14 5/8"] w6h6 allow you to customize airflow+ Product Details Size 18"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 14 5 8" height Actual Filter Size 17 3 4"w x 11 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.