32" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 Measuring 4" in diameter for

Measuring 4" in diameter for the duct opening

actual front end outer dimensions are approximately 21 5/8" width X 33 5/8" height

actual front end outer dimensions are approximately 20 5/8" width X 338 5/8" height

+ Product Details Size – 36"w X 8"h is the size for the duct opening measurement only

32" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 Measuring 4" in diameter for+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 28" OR 28" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 75" x 27. 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