28" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w25h25 Our coils have a a Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Our coils have a a very high PSI burst pressure

+ Product Details Size – 20" x 20" is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 10" duct openings

actual front end outer dimensions are 21

+ Product Details Size - 25"w X 14"h is the size for the duct opening measurement only

28" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w25h25 Our coils have a a Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Our coils have a a very high PSI burst pressure + Product Details Size – 20" x 20" is the size for the duct opening measurement only