elopment, Design, Manufacturing, Engineering, Sales, After sale service as one.Our service1.?? After-sales service hotline 400-0512-6682.?? All fan components warranty for three years3.?? Free provide ventilation improvement combination solutions4.?? OEM serviceFAQ1. If i will need to stay in your place for few days, is that possible to book the hotel for me?It’s always my pleasure, hotel booking service is available.2. What is your minimum order quantity, can you send me samples?Our mi