36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Filter Size - 33

Filter Size - 33

High Standard

+ Product Details Size – 14"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 16" OR 16" X 18" duct opening (measured at the opening)

+ Product Details Size – 24" x 28" or 28" x 24" is the size for the duct opening measurement only

36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Filter Size - 33+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 30" OR 30" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 29. 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