12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille w30h30 allowing you to take control

allowing you to take control of indoor air circulation without complications

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

actual front end outer dimensions are approximately 23 5/8" width X 7 5/8" height

Actual Filter Size – 29 3/4"w x 27 3/4" x 1"

12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille w30h30 allowing you to take control+ Product Details Size 12" x 20" or 20" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 21. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing