the company's main business: factory ventilation and exhaust, workshop work station smoke exhaust, welding workshop smoke exhaust, hot pot restaurant, barbecue restaurant smoke exhaust, kitchen oil fume exhaust, commercial building central air conditioning pipeline installation, basement smoke exhaust, pharmaceutical factory clean air duct, industrial waste gas treatment, hotel ventilation and smoke exhaust system, kitchen smoke exhaust, oil fume purification, sound and dust removal, pipeline insulation, environmental protection projects, factory and workshop ventilation, dust removal, shopping malls, hotels, internet cafes, clubs, etc., air treatment, grinding workshop vacuum cleaning, etc., production, installation and construction of ventilation ducts.