Roof Ventilator Supply In Andhra Pradesh Andhra Pradesh. These ventilators consume wind energy to create airflow via centrifugal action. It is this centrifugal force created by rotating vanes creating a low pressure zone in turn. This low pressure zone is responsible for oozing out heat and polluted air and drawing in fresh air. This cycle is repeated consistently for a long duration of time, in order to cleanse and rejuvenate the air of ... Continue