32" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 36" or 36" x 8" duct opening (measured at the opening)

actual front end outer dimensions are approximately 12 5/8" width X 20 5/8" height

Actual Filter Size – 7 3/4"w x 19 3/4" x 1"

Whether installed on a sidewall or ceiling

32" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Perfect Fit+ 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