Objective To assess the application of hazard analysis and critical control point (HACCP) technique to the health supervision and management of central air conditioning and ventilation system.
Methods A health supervision was conducted in eight buildings (four hotel,two shopping malls,and two office buildings) installed with central air conditioning and ventilation system in Pudong New Area of Shanghai during May 2012 to March 2014.Hazardous factors for health management of central air conditioning and ventilation system were determined,as well as critical control points,control standards,and control measures.Comparison was made before and after the HACCP implementation.
Results By adopting the HACCP technique to analyze all processes and segments of selected central air conditioning and ventilation systems' operation and management,we determined significant hazards and critical control points and established a corresponding HACCP plan.After implementation of the HACCP plan,the eight buildings' amount of dust on the duct surface decreased from 0.1-349.4 g/m2 to 0.1-16.1 g/m2;the total number of fungi in dust accumulated in air ducts decreased from 0-660 cfu/cm2 to 0-58 cfu/cm2;the qualified rate of the two indicators increased from 50.0% and 81.6% to both 100.0%,respectively (P < 0.05);significant improvements in sanitary status were identified in fresh air inlets,air conditioning systems (air processing unit,surface cooler,heater/moisturizer,condensed water pan),and cooling towers,and the qualified rate changes of above mentioned items were significant before and after implementing the HACCP plan (P < 0.05).
Conclusion Adopting HACCP technique to conduct health supervision and management of central air conditioning and ventilation systems facilitates standardizing management process,enhancing management ability,and improving the sanitary quality of central air conditioning and ventilation systems.
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