18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille 1-Way + Product Description Upgrade your

+ Product Description Upgrade your HVAC system with our 8" Round Air Vent Supply Grille

also called T-Bar systems

Removable core for access to optional damper

1/4" - 6518 PSI

+ Product Details Size – 16"w X 30"h is the size for the duct opening measurement only

18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille 1-Way + Product Description Upgrade your+ Product Details Size 18" x 20" or 20" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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