18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 #hvac-product-accordion { border: 2px solid

#hvac-product-accordion { border: 2px solid #5296DD

high-impact clear plastic

where form meets function flawlessly

but still light and handy

18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 #hvac-product-accordion { border: 2px solid+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 8" OR 8" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 7. 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