34" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –

+ Product Details Size – 28"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 36 5/8" height

+ Product Details Size – 30"w X 36"h is the size for the duct opening measurement only

R value rating of insulation - R3

34" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 24" Or 24" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 23. 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