34" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening)

color: #333

designed for superior airflow (up to 95%) and easy filter access

+ Product Details Size – 8" x 18" or 18" x 8" is the size for the duct opening measurement only

34" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 36" OR 36" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 35. 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