18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter these louvers are built to

these louvers are built to last

+ Product Details Size – 18" x 28" or 28" x 18" is the size for the duct opening measurement only

this flex duct decreases the pressure loss and provides a more hygienic environment

actual front end outer dimensions are approximately 32 5/8" width X 28 5/8" height

actual front end outer dimensions are approximately 22 5/8" width X 52 5/8" height

18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter these louvers are built to+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 32" OR 32" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 31. 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