30" X 6" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 32 5/8" X 8 5/8"] Adjustable Return + Product Details Size - Ducting Components RG2016 FBA-HP Applications The C box

+ Product Details Size - 36"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 14"h is the size for the duct opening measurement only

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And Meets/Beats ASTM B280 Standard

Quality Packaging – carefully shrink wrapped with cardboard backing to prevent damage in shipment

30" X 6" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 32 5 8" X 8 5 8"] Adjustable Return + Product Details Size Ducting Components RG2016 FBA HP Applications The C box + Product Details Size 36"w X 18"h is the size for the duct opening measurement only + Product Details Size 28"w X 14"h is the size for the duct opening measurement only