36" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Diameter including the ability to mount Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

including the ability to mount without removing the thermostat when using the ring base

+ Product Details Size - 24"w X 8"h X 2"d (for duct opening measurement only)

with actual outer dimensions of 36

+ Product Details Size – 24"w X 24"h

+ Product Details Size – 16"w X 18"h is the size for the duct opening measurement only

36" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Diameter including the ability to mount Compatible With Duct 7in Applications This sheet metal DDAG A 1212 including the ability to mount without removing the thermostat when using the ring base + Product Details Size 24"w X 8"h X 2"d (for duct opening measurement only)