8" x 30" or 30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 32.5"] Compatible With Duct 12in High Quality – Solid stamped Ducting Components RG2016 FBA-HP Applications The C box

High Quality – Solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 20" OR 20" x 24" duct opening (measured at the opening)

+ Product Details Size - 4"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 30 5/8" height

+ Product Details Size – 30" x 32" or 32" x 30" is the size for the duct opening measurement only

8" x 30" or 30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 10.5" X 32.5"] Compatible With Duct 12in High Quality – Solid stamped Ducting Components RG2016 FBA HP Applications The C box High Quality – Solid stamped steel with counter sunk screw holes (screws included) and no sharp edges + Product Details Perfect Fit & Easy Sizing Designed for a 24" x 20" OR 20" x 24" duct opening (measured at the opening)