18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Round Duct Pipe + Product Details Size –

+ Product Details Size – 10" x 36" or 36" x 10" is the size for the duct opening measurement only

} /* MORE SPACE BETWEEN ACCORDIONS */ #hvac-product-accordion

+ Product Details Size – 16"w X 24"h is the size for the duct opening measurement only

Weather and Pest Proof – These louvers are especially designed to prevent water from entering your home

18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Round Duct Pipe + Product Details Size –+ 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