There are Fan Section offered by us that is a highly efficient, heavy duty air flow device that is constructed from exceptionally durable materials and components to withstand stringent environments and operate longer to provide constant air flow and pressure. The function of draft in a combustion system is to exhaust the products of combustion into the atmosphere. Additionally, this supply fan can also be used with ductless HVAC solutions to provide an excellent fresh air solution. A typical local exhaust ventilation system is composed of five parts: fans, hoods, ducts, air cleaners, and stacks. Fan Section is very effective.