airmid healthgroup, a third-party indoor-air-cleaning device test facility, has released the laboratory test results of a new combination ultraviolet light, activated carbon-media air purification and photocatalytic oxidation device.
The Dublin, Ireland-based airmid healthgroup, an international leader of indoor air quality-equipment testing, successfully demonstrated the APCO air purifier manufactured by Fresh-Aire UV has the capability to both sterilize microorganisms and reduce volatile organic compounds (VOCs). airmid healthgroup reported the APCO's UV light was "highly effective" at inactivating microbes, and that its titanium-dioxide infused carbon media matrix and PCO combination was "capable of reducing high concentrations" of VOCs commonly found in residences and commercial buildings, such as hospitals, hotels, offices and schools.
The UV-C light portion of the study simulated airstream microbe inactivation in an ASTM-/AHAM-style environmental test chamber that simulated a typical building's indoor environment and HVAC air-handler arrangement. A single-pass test was also performed on an ASHRAE Standard 52.2 test duct system.
The test's UV-C light single-pass inactivation results were: bacteria (S. epidermidis)—98.85%; virus (MS2 coliphage)—99.03%;and mold (A. niger)—78.80%.
The test, which simulated the typical indoor HVAC conditions of 73°F (23°C), 55% relative humidity and air-flow velocity of 492 ft/min (0.93m3/sec), was performed on a single pass. Indoor air quality experts claim even higher inactivity rates among the three tested microbes could occur in a multiple-pass environment, such as a typical building HVAC-recirculation unit with an APCO device.