28" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 36 5/8"] w26h26 + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 24" x 24" with 14" collar T-Bar drop ceiling perforated return grill - metal back casing

+ Product Details Size - 36"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 9

1/2" - 3119 PSI

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28" X 34" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 30 5 8" X 36 5 8"] w26h26 + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 24" x 24" with 14" collar T Bar drop ceiling perforated return grill metal back casing + Product Details Size 36"w X 20"h is the size for the duct opening measurement only