8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille RG66 Black-HP + Product Details Size –

+ Product Details Size – 8" x 36" or 36" x 8" is the size for the duct opening measurement only

ISO Supply Diffusers perform efficiently with air loadings of 6 to 30 air changes per hour (based on 10 ft

14" x 4" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

actual front end outer dimensions are approximately 16 5/8" width X 16 5/8" height

8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille RG66 Black-HP + Product Details Size –+ Product Details Size 8" x 28" or 28" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 29. 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