Our range also increases the life span of walls, roof sheet and structure. Air Ventilators Benefits:• As the polluted air is replaced by fresh air, people working inside will be active and healthy & their productivity will be increased• Proper air ventilation will enhance the life of the roof sheet, structures, wall etc by removing accumulated heat, humidity (dampness) and polluted air. • Aci vents saves total electricity used for power exhaust system. Round the clock it works without any expenditure.