• The TEF-N series roof exhaust fan us through the turbine balding shell in leaf blade to catches the windward sides blow and push rotor blade shell revolving .Because of revolving the turbine blading shell has the centrifugal force, includes the whorl shell inside are discharges through the leeward leaf blades, due to are extraction , causes in the turbine shell lower part the appendix region have the negative pressure, to maintain the air dynamical equilibrium, the positive pressure region's air naturally flow to the negative pressure zone, then achieve the effect of ventilation. The turbine ventilator include the turbine wheel, the central shaft system, cuts the wind piece, the crossing margin, an alter and so on. It is not only taking natural lighting ,moreover the waterproof efficiency may reach 100%.