12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter White } /* TITLE TEXT */

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complete with a supplied key

Actual Filter Size – 33 3/4"w x 21 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 36" OR 36" x 30" duct opening (measured at the opening)

with actual outer dimensions of 30

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter White } /* TITLE TEXT */+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 35. 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