26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 33 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Actual Filter Size – 33 3/4"w x 15 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening)

actual front end outer dimensions are approximately 32 5/8" width X 8 5/8" height -

+ Product Details Size – 25"w X 18"h is the size for the duct opening measurement only

The 1/2" black insulation

26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 33 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 33 3 4"w x 15 3 4" x 1" + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening)