12" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 14 5/8"] w14h14 Complies with industry standards of

Complies with industry standards of USA: ASTM D-882

no exceptions

+ Product Details Size – 12" X 2" is the size for the duct opening (floor/vent hole) measurement only

Heavier gauge than needed

Design – Circular return valves - designed to be used in low and medium pressure ventilation air conditioning systems

12" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 14 5/8"] w14h14 Complies with industry standards of+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 14 5 8" height Actual Filter Size 11 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 Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter