16" x 18" or 18" x 16" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood 8" Diameter Is The Size

8" Diameter Is The Size For The Duct Opening Measurement Only

Actual Filter Size – 31 3/4"w x 17 3/4" x 1"

75" width X 19

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

actual front end outer dimensions are approximately 22 5/8" width X 14 5/8" height

16" x 18" or 18" x 16" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood 8" Diameter Is The Size+ Product Details Size 16" x 18" or 18" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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