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actual front end outer dimensions are approximately 18 5/8" width X 34 5/8" height
Built with rust-resistant aluminum and a scratch-resistant powder-coated finish
3 * Insulation density is 30kgs/CBM = 0
+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 20" or 20" x 12" duct opening (measured at the opening)
+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only
20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades actual front end outer dimensions+ 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