34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP + Product Details Size –

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

actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

Actual Filter Size – 31 3/4"w x 11 3/4" x 1"

75" width X 19

34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP + Product Details Size –+ 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