Hvac engineering is the core and important part of scientific laboratory construction. In order to provide a safe and comfortable working environment and ensure accurate and reliable experimental results, we adopt international advanced air flow control technology, comply with ANSI, ASHRAE NFPA EN14175 standards, so that the laboratory gradient pressure is maintained in an ideal state, reduce the possibility of personnel exposure to dangerous air, and greatly reduce operating costs. Create more accurate, safer and more comfortable science laboratories.