28" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter Our filter grille latch is

Our filter grille latch is easy to use on your fingers and requires no screwdriver to open

Actual Filter Size – 31 3/4"w x 23 3/4" x 1"

Actual Filter Size – 9 3/4"w x 21 3/4" x 1"

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

28" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter Our filter grille latch is+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 36" OR 36" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 35. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum