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Standard
Scope of Application
Mainly used to guide the design, installation, and airtightness classification of air duct systems. It is usually used in projects with high requirements for airflow stability, such as hospitals, laboratories, and industrial smoke exhaust systems, but it is not a mandatory condition for market access.
Core Technical Requirements
Material Pressure Test and Airtightness Requirements:
Class A (High-pressure System): Air leakage ≤2m³/(h·m²), applicable to occasions with pressure >1500Pa.
Class B (Medium-pressure System): Air leakage ≤4m³/(h·m²), corresponding to pressure 500~1500Pa.
Class C (Low-pressure System): Air leakage ≤6m³/(h·m²), applicable to pressure ≤500Pa.
Plate Thickness Requirements
High-pressure systems require thicker plates (e.g., the thickness of galvanized steel plates must meet high-pressure standards).
Smoke exhaust systems are treated as high-pressure systems and require enhanced sealing and fire performance.
Connection Process
High-pressure air duct joints require double sealing (e.g., flange + sealant), while medium and low-pressure systems can use single-layer sealing.