34" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 22" OR 22" x 20" duct opening (measured at the opening)

This simple adjustment reduces HVAC strain

+ Product Details Size - 32"w X 36"h is the size for the duct opening measurement only

Rigid design with noise free components - quiet airflow

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34" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 28" Or 28" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 27. 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