20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille sidewall Design – Equipped with lever

Design – Equipped with lever for full airflow control

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

transparent design and durable construction

Incorporated with Integral Butterfly Damper for full Airflow Control

providing a stylish and practical solution for ventilation

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille sidewall Design – Equipped with lever+ 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