18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter Perfectly suited for both residential

Perfectly suited for both residential and commercial use

+ Product Details Size – 34"w X 36"h is the size for the duct opening measurement only

please note that the total outer dimensions of the grille measure 16" in diameter

actual front end outer dimensions are approximately 32 5/8" width X 24 5/8" height -

+ Product Details Size – 26"w X 32"h is the size for the duct opening measurement only

18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter Perfectly suited for both residential+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 10" OR 10" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 9. 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