GB/T 18204.5-2025

This standard specifies the testing methods for evaluating the hygiene quality of central air conditioning and ventilation systems in public places, including sampling procedures for cooling towers, air handling units, and duct surfaces. It is applied by health inspection authorities and facility management teams to detect microbial contamination (e.g., Legionella, fungi) and particulate levels in venues such as shopping malls, office buildings, and hotels. The standard ensures compliance with public health regulations by providing standardized protocols for system maintenance and risk assessment.