30" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 32 5/8" X 14 5/8"] Aluminum Bar + Product Details Size – RG2230 HP w4h4 const modal document

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

Operating temperature from -40°f to +248°f [-40°c to +120°c]

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+ Product Details Size - 14"w X 32"h is the size for the duct opening measurement only

And is classified as Class 1 Fire Proof - B1

30" X 12" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 32 5 8" X 14 5 8"] Aluminum Bar + Product Details Size – RG2230 HP w4h4 const modal document + Product Details Size – 10"w X 10"h is the size for the duct opening measurement only Operating temperature from 40°f to +248°f [ 40°c to +120°c]