34" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Anodized Aluminum Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 14" duct openings

+ Product Details Size – 28"w X 24"h is the size for the duct opening measurement only

Versatility and Durability: The red oak wood not only adds a touch of warmth and softness to your room but can also be sanded and refinished according to your specific application needs

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

Filter Size - 29

34" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Anodized Aluminum Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 32" Or 32" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 31. 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