30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 R Value Rating of Insulation

R Value Rating of Insulation - R3

actual front end outer dimensions are approximately 26 5/8" width X 32 5/8" height

+ Product Details Size – 6"w X 12"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 16" or 16" x 10" duct opening (measured at the opening)

Filter Size - 35

30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 R Value Rating of Insulation+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 12" OR 12" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 11. 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