26" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 20" duct opening (measured at the opening)

+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening)

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& EN 13180 standards

26" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 20" duct opening (measured at the opening) + Product Details Size 24"w X 12"h is the size for the duct opening measurement only