36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat actual front end outer dimensions

actual front end outer dimensions are approximately 34 5/8" width X 18 5/8" height

+ Product Details Size – 24"w X 26"h is the size for the duct opening measurement only

Refrigerant - 1/2" White Insulation - 50' Long

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

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