30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter Ideal for Walls & Ceilings: Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 6" duct openings

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

The back is completely insulated

actual front end outer dimensions are approximately 12 5/8" width X 14 5/8" height

+ Product Details Size - 20"w X 6"h is the size for the duct opening measurement only

30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter Ideal for Walls & Ceilings: Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 6" duct openings + Product Details Size 30"w X 18"h is the size for the duct opening measurement only