INDOOR AIR QUALITY

Sub-Cooling Heating & Air has been receiving inquiries regarding the effectiveness of UV disinfection systems against COVID-19 (coronavirus) in the HVAC air stream in preparation of re-opening an establishment. We believe the best approach is to be as transparent as possible and to explain the fundamentals and variables that play a factor in inactivating coronavirus and other pathogens with UVC germicidal technologies.

UV systems are installed in the HVAC unit and/or ductwork and are designed to disinfect surfaces and the air as it circulates through the ventilation system. UV dosage can be measured in several ways including microwatts per second/centimetres 2 (μWs/cm2) or surface area.

UV systems are tested and validated against bacteria, viruses, mold & fungus. The UV systems have been tested and achieve up to a *99.999% reduction on microorganisms. There are a number of factors that need to be addressed in order to determine efficiency, these include but not limited to, the application, such as surface or air disinfection, air velocity and temperature, recirculation rates, and dwell time, as well as the specific biological target.

UV disinfection systems for HVAC equipment are an ideal proactive measure to complement filtration. Microorganisms, particularly viruses, are so small that filters are mostly ineffective. The UV systems have also been shown to reduce problematic molds and pathogens that are found within the HVAC system and drain pan that would otherwise be introduced and distributed throughout the envelope of the building.

For more information on UV systems or to discuss your specific application,