16" x 18" or 18" x 16" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set + 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 – 6" x 36" or 36" x 6" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 12 5/8" height -

+ Product Description Enhance your ventilation system with our high-quality grilles and registers

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 30" OR 30" x 24" duct opening (measured at the opening)

16" x 18" or 18" x 16" Cube Core Eggcrate Return Air Grille Copper Coil Insulated Line Set + 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 – 6" x 36" or 36" x 6" is the size for the duct opening measurement only