28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille w34h34 As The Hot Air Will

As The Hot Air Will Flow Up & Out

3/8" - 4223 PSI

+ Product Details Size – 8"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 21 3/4" x 1"

actual front end outer dimensions are approximately 12 5/8" width X 10 5/8" height

28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille w34h34 As The Hot Air Will+ Product Details Size 28" x 36" or 36" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 75" X 37. 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