20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter fixed bar + Product Details Size –

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

85" width X 11

offering maximum flexibility

This thoughtful design ensures optimal air circulation for your HVAC system

20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter fixed bar + Product Details Size –+ 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