The 3050 Portable Direct Fired Heater, provided by On Site Companies, is a great tool for a large and busy job site. The 3050 heater has many safeguards in place to make sure that nothing goes wrong with the equipment. For instance, if the combustion air is interrupted, the 3050 will automatically shut down the system. It also shuts down if the product is being over fired. The heat can also be ducted up to 300 feet from where the equipment is stationed.