34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP 75"H – fits a 16"

75"H – fits a 16" X 16" duct opening

3-cone supply grille

+ Product Details Size – 4"w X 12"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 12" or 12" x 14" duct opening (measured at the opening)

34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP 75"H – fits a 16"+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 20" Or 20" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 19. 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