Burkhart J E, Stanevich R, Kovak B
Bibliographic info:
Applied Occupational and Environmental Hygiene, Vol 8, No 12, December 1993, pp 1010-1014, 3 figs, 1 tab, 8 refs.

The study collected water samples from 33 of 54 HVAC humidification system water reservoir pans in a large office building. The nature of the contamination that was found indicated that cleaning was ineffective, and may increase the risk of biological contamination. Of the two different humidification systems, air wash and steam injection, the air wash system revealed high contamination of samples.