20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core One model suits both T-Bar

One model suits both T-Bar and Drywall installations

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

Ideal for VAV systems

+ Product Details Size – 26"w X 36"h is the size for the duct opening measurement only

+ Product Details Size – 34" x 36" or 36" x 34" is the size for the duct opening measurement only

20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core One model suits both T-Bar+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 8" OR 8" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 7. 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