20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille sidewall + Product Details Size –

+ Product Details Size – 48"w X 24"h is the size for the duct opening measurement only

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

5" width x 13

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

Design – Equipped with lever for full airflow control

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille sidewall + Product Details Size –+ Product Details Size 20" x 30" or 30" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 31. 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