22" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Round Duct Pipe + Product Details Size –

+ Product Details Size – 34"w X 30"h is the size for the duct opening measurement only

This Will Create A Cycle Of In And Out Air FLow

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 18" or 18" x 12" duct opening (measured at the opening)

+ Product Details Outer dimensions: 19

22" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Round Duct Pipe + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 8" OR 8" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 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