36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 10" actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 14 5/8" height

these louvers provide exceptional protection against rain and water

+ Product Details Size - 36"w X 24"h is the size for the duct opening measurement only

+ Product Description Introducing the 6" Butterfly Damper – Your Solution for Controlled Airflow

Actual Filter Size – 31 3/4"w x 13 3/4" x 1"

36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 10" actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 12" OR 12" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 11. 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