22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe /* more readable bullets */

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 10" or 10" x 8" duct opening (measured at the opening)

[Outer Dimensions: 38

our damper is designed to perfectly align with your setup

actual front end outer dimensions are approximately 27

22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe /* more readable bullets */+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 18" OR 18" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 17. 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