36" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Width_20in + Product Details Size -

+ Product Details Size - 34"w X 4"h is the size for the duct opening measurement only

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and Centralized Air Ducted Units

75"H – fits a 12" X 4" duct opening

[Outer Dimensions: 20

36" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Width_20in + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 22" OR 22" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 21. 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