36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size -

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

actual front end outer dimensions are approximately 12 5/8" width X 22 5/8" height

75" Width X 25

Removable core for access to optional damper

36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size -+ 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