6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille Fixed Blades while the included installation screws

while the included installation screws make setup quick and hassle-free

+ Product Details Size - 8"w X 6"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 25 3/4" x 1"

+ Product Details Size - 36"w X 6"h is the size for the duct opening measurement only

(Screws included)

6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille Fixed Blades while the included installation screws+ Product Details Size 6" x 8" or 8" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" width X 9. 75" height. 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%,