The 18' X 8' Supply Grill With Damper (without Neck) is a high-quality air grille and diffuser product designed for distributing and directing airflow in ducted ventilation systems. Built from quality materials, it delivers consistent, dependable performance even in demanding service conditions. Quality-checked for dependable performance, it offers excellent value without compromising on reliability. Whether you are an HVAC technician, contractor, or hands-on homeowner, this air grille and diffuser product is an essential addition to your ducting and ventilation supplies. Order today and keep your air-conditioning or refrigeration system running at its best.