22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in Actual Filter Size – 29 Product Details Perfect Fit LO612 Compatible With Duct 12in

Actual Filter Size – 29 3/4"w x 11 3/4" x 1"

This versatile solution enhances air supply and adds a touch of class to your space

+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 27 5/8" height

+ Product Details Size - 12"w X 34"h is the size for the duct opening measurement only

22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in Actual Filter Size – 29 Product Details Perfect Fit LO612 Compatible With Duct 12in Actual Filter Size – 29 3 4"w x 11 3 4" x 1" This versatile solution enhances air supply and adds a touch of class to your space