12" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 28 5/8" height

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The 1/2" black insulation

Copper coil line set fits most ductless mini split air conditioners

12" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 23. 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