Cartel Energy carries Herman Nelson Portable Diesel Heaters. They provide clean, safe, economical, high capacity heating wherever it's needed. Our portable heaters have a capacity of 505,000 BTU and have a heater air output of 3,100 CFM. They have a discharge temperature of 220°F. Quick connect ducts attach to the front cap outlet(s) and enable the operator to disburse the heated air over a large area. We offer a single discharge 16" outlet or dual 12" outlets with necessary ducts included.