The TDI series of axials maximize efficiencies with cast aluminum, airfoil propellers. Their primary attributes include compact size and minimal maintenance. Additionally, TDI fans can be used with variable frequency drives to accommodate modulating performance requirements. Typical applications range from clean air exhaust to emergency smoke control where the TDI has been tested to exhaust airstream temperatures up to 300º F (149º C) for a minimum of 5 hours. The TDI series has performance capacities up to 95,000 CFM (161,000 m3/hr) and static pressures up to 2.75 inches w.g. (685 Pa).