Greenheck expanded its rooftop unit line with the new RT-20, its smallest model. The unit delivers 3–5 tons of packaged DX cooling, 500–2,000 cfm of airflow, and up to 175 mbh of indirect gas heating. The RT-20 joins models RT-40, RT-70 and RT-120, offering capacities up to 13,000 cfm. Greenheck RT units precisely control temperature and humidity with industry-leading standard features.