10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille 14" Diameter 8" Circular Round Aluminum HVAC

8" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

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actual front end outer dimensions are approximately 22 5/8" width X 27 5/8" height

Actual Filter Size – 35 3/4"w x 27 3/4" x 1"

10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille 14" Diameter 8" Circular Round Aluminum HVAC+ Product Details Size 10" x 18" or 18" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 19. 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