I want to suggest you about the acoventilator instead of the air
ventilator becasue the air ventilort is works only for the air while
the eco ventilotor works for the all type of ventilator just i needs
to explain this The Ecovent or Ecoventilator works by utilising the
velocity energy of the wind to induce air flow by centrifugal action.
The centrifugal force caused by the spinning vanes creates a region of
low pressure area which draws and throws out hot air from below and
fresh cool air from out side comes in. The slightest breeze will cause
the turbine to spin and even after the breeze has stopped, the fly
wheel affect of the rotor cage will use its stored energy to
continuously remove air giving rise to ventilation. Suction is
maintained even at low wind velocities. The Convective Thermal
currents are given boost by venturi dome to further enhance the
rotation of the Ecovent. so this method is better then the air
ventilator once you needs to try for this and if you wants some more
informnation regarding this then please go to this website
http://www.anchitispat.com/ecoventilator.htm or <a href="http://
www.anchitispat.com/ecoventilator.htm">ecoventilator</a>