12" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 18 5/8"] Aluminum Bar + Product Details Size –

+ Product Details Size – 36"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 25" OR 25" X 16" duct opening (measured at the opening)

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

+ Product Details Size - 25"w X 10"h is the size for the duct opening measurement only

12" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 18 5/8"] Aluminum Bar + Product Details Size –+ Product Details Size 12"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 18 5 8" height Actual Filter Size 11 3 4"w x 15 3 4" x 1" High quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter