20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter fixed bar Horizontal performance assures confident use

Horizontal performance assures confident use of cooling temperature differential of 30 degrees Fahrenheit and greater

+ Product Details Size – 6"w X 6"h is the size for the duct opening measurement only

offering maximum flexibility

+ Product Details Size - 10"w X 14"h is the size for the duct opening measurement only

[Outer Dimensions: 22

20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter fixed bar Horizontal performance assures confident use+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 18" OR 18" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 17. 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