18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 28 5/8" width X 22 5/8" height

Actual Front End Outer Dimensions Are 12" Width X 6" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

R value rating of insulation - r3

modern touch to your home

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18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 34" OR 34" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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