16" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening)

+ Product Details Size - 12"w X 34"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 8" OR 8" X 16" duct opening (measured at the opening)

Vertical blades in the back

16"w X 3"h Is The Size For The Duct Opening Measurement Only

16" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening) + Product Details Size 12"w X 34"h is the size for the duct opening measurement only