20" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home these airflow control components provide

these airflow control components provide you with effortless control over your indoor environment

Actual Filter Size – 31 3/4"w x 27 3/4" x 1"

Whether you're updating a single room or renovating an entire space

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

20" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home these airflow control components provide+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 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