Low-pressure system: A fine water mist fire extinguishing system with a system network operating pressure less than or equal to 1.21 MPa.
Medium-pressure system: A fine water mist fire extinguishing system with a system network operating pressure greater than 1.21 MPa and less than or equal to 3.45 MPa.
High-pressure system: A fine water mist fire extinguishing system with a system network operating pressure greater than 3.45 MPa.
