20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper Complies with industry standards of

Complies with industry standards of USA: ASTM D-882

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+ Product Details Size – 12"w X 12"h

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height -

20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper Complies with industry standards of+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 34" OR 34" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 33. 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