Whether you are our current customer or new customer, we can supply the most suitable ventilation design, free of charge. 7 days * 24 hours related to our products will be replied in 24 hours. Skilled and experienced staff will answer all your questions with pre-sales and after-sales. We have more than 16 years experience of manufacturer and sales. Each products will be 100% inspected before leaving the factory. Aipu fans has always been committed to the pursuit of excellence in quality, to meet customer demand, to create high-quality products.