36" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w12h12 14" Diameter Is The Size

14" Diameter Is The Size For The Duct Opening Measurement Only

Actual Filter Size – 31 3/4"w x 29 3/4" x 1"

And Meets/Beats ASTM B280 Standard

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

No Sharp Surface Edges

36" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w12h12 14" Diameter Is The Size+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 26" OR 26" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 25. 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