18" X 24" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 26 5/8"] return grille + Product Details Size –

+ Product Details Size – 10" x 10" is the size for the duct opening measurement only

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Think of the diameter as a straight line from one end to the other

Both lines taped together every 18in for easier handling & installation

+ Product Details Size - 32"w X 16"h is the size for the duct opening measurement only

18" X 24" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 26 5/8"] return grille + Product Details Size –+ Product Details Size 18"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 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