18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Grille white const content = item

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and sound level range of NC 25 to 35

Installation of the vents will eliminate the need to raise the door ensuring security and constant air flow and reduced heat transfer into attics and adjacent house walls

Design – Removable door/face for easy filter change & cleaning - uses a 1" thick filter

Actual Filter Size – 21 3/4"w x 13 3/4" x 1"

18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Grille white const content = item+ Product Details Size 18" x 28" or 28" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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