32" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 including the ability to mount

including the ability to mount without removing the thermostat when using the ring base

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+ Product Details Size - 4"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 10 5/8" height

32" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 including the ability to mount+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 8" OR 8" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 75" x 9. 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