ultraviolet light

UV-C is also produced by the sun, but cannot penetrate the atmosphere due to its shorter wavelength.

Not all HVAC&R technicians receive UV-C safety training, and some may not be aware that the UV-C light in an air-handling unit (AHU) can potentially pose a safety hazard.

Many HVAC&R and UV-C equipment manufacturers have voluntarily implemented safeguards against the risks of UV-C exposure.

These updated requirements will help ensure that the risk to service workers is reduced irrespective of their proximity to the UV-C source.

* No opening shall permit leakage of UV-C greater than 0.1 microwatts per centimeter squared ([micro]W/[cm.sup.2]).

* Enclosure doors, covers, and access panels, when accessed, shall have no UV-C irradiance greater than 1.7 [micro]W /[cm.sup.2].