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Our company 

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Our Services
Longfian holds the concepts of "All work for customers" and "Customer satisfaction is premise of our progress". These service concepts gradually penetrate to every department in our company, including sales department, production department, quality control department, engineering department, R&D center, etc.
When receiving customers' requirements, we will give replies as soon as possible. If the customers are not satisfied with the replies, we will arrange our engineers to communicate with them directly until they are satisfied.
Warranty Period
A: 15 months for the whole unit
B: 24 months for compressor
Pre-sales Service
1. We will communicate with customers to know about their requirements. 
2. Necessary samples and technical documents will be offered to customers.
3. We will guide customers to use our oxygen concentrator correctly and safely.
4. Our company also provides other services such as packing & designing as well as oxygen concentrator knowledge training.
5. OEM service is available.
In-sales Service
1. Delivery time is within 3-20 working days (according to specific order quantity) upon receiving the advance payment.
After-sale Service 
1. Inquire of customers about the working conditions of their oxygen concentrators and help them settle problems in time.