20" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home 14" Diameter Is The Size

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

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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"

+ Product Details Size – 18"w X 12"h 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 14" Diameter Is The Size+ 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