26" x 6" or 6" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size –

+ Product Details Size – 18" x 32" or 32" x 18" is the size for the duct opening measurement only

+ Product Details Size - 18"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 28"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 8 5/8" height

vibration-free performance

26" x 6" or 6" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 6" OR 6" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 5. 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 Made