Field test and analysis of microbial contamination in central air conditioning systems

Performs the detailed test in Shaanxi History Museum. The results indicate that the bacteria removing efficiency of the roughing filter is higher than the fungi; and that there are fungi growth in the air conditioning system with the maximum fungi concentration up to 200.3 cfu/piece, microbial contamination in systems results in poor indoor air quality. Finds that a positive linear correlation between microbial concentration and relative humidity is obvious; the dominant fungi is Penicillium, Aspergillus and Cladosporium.