10" X 24" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 12 5/8" X 26 5/8"] Insulated Line Set accordion-title { font-size: 17px

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+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only

the actual front end outer dimensions are 6" in diameter

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1/2" White insulation will give you a good R value of 3

10" X 24" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 12 5/8" X 26 5/8"] Insulated Line Set accordion-title { font-size: 17px+ Product Details Size 10"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 12 5 8" width X 26 5 8" height. High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Ceiling Design Fixed hinged for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your fingers and