INDEPENDENT TESTING OBJECTIVE
In June of 2015, 3 Fan Coil Units where professionally cleaned by a National HVAC Cleaning Contractor, as part of a regular servicing and maintenance program.
All 3 FCU’s were located next to one another, and used to cool the main production area of a food processing plant in Queensland, Australia. On completion of cleans a Germicidal UVC system was installed on 1 of the FCU’s to provide 24/7 sterilization of the cooling coil. To reduce the risk of microbial contaminants recolonizing in the cooling coil and causing contaminated blow off into the occupied spaces.
The remaining 2 FCU’s had no form of surface or air sterilization installed. 5 months later, in December of 2015, Australian Air Quality Systems where commissioned
to conduct microbial sampling of all 3 refrigerated FCU’s, to test contamination levels across all three systems and compare the results. Swab samples were sent to NATA accredited lab for culturing and analysis.
Sample Identification: [Lab No.: 632266]
FCU1 (UVC Installed)
Plate Count (2days @ 35 °C) <40 CFU/sq cm
Yeast & Mould <40 CFU/sq cm
Sample Identification: [Lab No.: 632267]
FCU2 (No UVC)
Plate Count (2days @ 35 °C) <980 CFU/sq cm
Yeast & Mould <760 CFU/sq cm
Sample Identification: [Lab No.: 632268]
FCU3 (No UVC)
Plate Count (2days @ 35 °C) <1230 CFU/sq cm
Yeast & Mould <1150 CFU/sq cm