Industrial Purpose Ventilation Systems are used to remove unpleasant smells and excessive moisture, introduce outside air, and to keep interior building air circulating, to prevent stagnation of the interior air. The Systems changes or replaces the air in any space to remove moisture, odours, smoke, heat, dust and airborne bacteria. The Systems includes both the exchange of air to the outside as well as circulation of air within the building. The Industrial Purpose Ventilation Systems is used for maintaining acceptable indoor air quality in buildings.