36" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w14h14 Actual Front End Outer Dimensions

Actual Front End Outer Dimensions Are 3

complete with a supplied key

+ Product Details Size - 26"w X 4"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 31 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 20" OR 20" x 28" duct opening (measured at the opening)

36" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w14h14 Actual Front End Outer Dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 24" OR 24" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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