18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter Experience hassle-free installation and full

Experience hassle-free installation and full adjustability for optimal airflow

Actual Filter Size – 35 3/4"w x 21 3/4" x 1"

these louvers provide exceptional protection against rain and water

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 20" OR 20" x 18" duct opening (measured at the opening)

1/4” - 6518 PSI

18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter Experience hassle-free installation and full+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 10" OR 10" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 9. 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