18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w26h26 simply pop the diffuser into

simply pop the diffuser into the wall duct hole and let the side springs hold it securely in place

1-1/8” - 2334 PSI

Actual Front End Outer Dimensions Are 18" Width X 5" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

+ Product Details Size - 26"w X 16"h is the size for the duct opening measurement only

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

18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w26h26 simply pop the diffuser into+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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