20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Design – Multi-shutter damper with

Design – Multi-shutter damper with handle lever for easy opening and closing - screws included

Actual Filter Size – 27 3/4"w x 27 3/4" x 1"

Designed for a 1" thick filter

+ Product Details Size – 16"w X 25"h is the size for the duct opening measurement only

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20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Design – Multi-shutter damper with+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 34" OR 34" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 33. 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