28" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grilles R value rating of insulation

R value rating of insulation - r3

+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

Actual Filter Size – 15 3/4"w x 31 3/4" x 1"

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