IAQ News

More Air Changes Do Not Always Lead to Lower Virus Levels

One might think that rapid air changes would be a good way to dilute the SARs-CoV-2 virus and prevent its spread throughout a building. While this seems intuitive, new studies show this isn’t the case. In fact, rapid air changes spread the virus from the source at higher concentrations. Within 30 minutes of an air change, particle levels spike and stay elevated for another 90 minutes. Therefore, building managers should be aware that more air changes are not always effective in reducing virus concentrations. No Clear Benefit to Higher Air Change Rates Previous studies have focused on aerosol spread within a one-room building. In this case, increased ventilation reduces the concentration of the virus. However, a new study in multi-room buildings shows that air exchanges elevate virus concentration in adjoining rooms. Researchers, including HVAC experts, in the U.S. Department of Energy’s Pacific Northwest National Laboratory conducted the study. The study's author, Leonard Pease, compared the finding to the way secondhand smoke from cigarettes reacts to air exchange. The smoke is reduced in the room where the air ...
Read More

To Combat Indoor Air Pathogens Effectively a Paradigm Shift has Begun

Given what we know about the aerosol transmission of the COVID-19 virus, indoor air quality has never been more important. As a result, a building's HVAC system remains an essential part of creating and maintaining healthy indoor air. You can think of an HVAC system as the lungs of the building only in reverse. The system “inhales” used air and “exhales” clean air into the building environment. To give the building’s “lungs” the best chance for success, it is important to keep them clean and maintained. In addition, regular inspections and monitoring help keep systems in top working order. Doing so gives facilities managers an effective weapon to combat indoor air pathogens. Changing Our Approach to Combat Indoor Air Pathogens Dr. Rajiv Sahay, FIAS, CIAQP, is Pure Air Control’s Chief Scientific Officer (CSO) and director of Environmental Diagnostics Laboratory. He believes there needs to be a transformative change in the way we approach the spread of the COVID-19 virus indoors. The costs in both lost revenue and the impact on occupant health are too substantial if we ...
Read More

Improve Ventilation by Keeping HVAC Equipment Clean

We’ve learned a lot about the SARS-CoV-2 virus over the past year. For example, we know that the virus spreads more easily indoors. We also know that improving ventilation reduces viral particle concentration. This lowers the risk of building occupants inhaling these particles or coming in contact with them on hard surfaces. Better ventilation does not require replacing existing mechanical systems, however. That said, any effort to improve ventilation requires a commitment to keep HVAC equipment clean.  Increased outside air won’t be as effective if it has to pass through clogged HVAC systems. Dirty evaporator coils make the system much less effective. For example, a build-up of dirt and debris as small as 3/16th of an inch drops coil efficiency by as much as 21 percent. This is also true for equipment placed in the ductwork such as VAV terminal boxes and reheat coils. When fresh air dampers and vents become fouled, they may stop opening and closing properly or even fail. The same is true for the turning vanes within the ductwork. Therefore ASHRAE recommends systems ...
Read More

Evidence-Based Approach to Air Purification Unit (APU’s)

Every day we take more than 3,000 gallons of air into our lungs. We do this with 12 to 15 breaths every minute which translates to roughly six million breaths per year. For this reason alone, we should care about the quality of the air we breathe. Building managers should know this and the recent pandemic only stresses this point. That said, we need to take an evidence-based approach to air purification devices. Unless action is taken, it leads to unhealthy building conditions resulting in, lower worker morale, absenteeism, high energy costs, discomfort and even worse death. Evidence-Based Approaches to Air Purification Many different types of contaminants, pollutants, and allergens - compromise the quality of indoor air. The SARS CoV-2 - increases these concerns. Facilities managers and building owners need effective technologies and services to create & manage healthy working and occupiable spaces. The use of air purification devices can be part of an effective way in purifying and managing or controlling the air quality as well as the quality of the air purification product. Several factors ...
Read More

Why IAQ Matters – Keep it Optimal

Health and wellness in the workplace was an issue even before the COVID-19, but as people return to work and businesses reopen it is even more important. Indoor air quality is a big part of creating a healthy indoor environment. On the other hand, poor IAQ leads to illnesses that cause a loss of productivity and lowers worker morale. It’s not just office buildings that are affected either. Schools, public sector buildings, retail outlets, bars, cafes, restaurants, gyms, and spas also feel the impact of poor IAQ. That presents a threat to the financial health of a business too. IAQ matters and it's easy to improve with a partner like PureAir Control Services. IAQ Matters to Virus Transmission The COVID-19 virus is being brought under control, but the danger remains and a future pandemic isn’t a matter of if, but when. One way viruses transmit themselves to their human hosts is through the tiny droplets of water we emit when we cough or sneeze. These droplets attach to aerosols such as dust particles which remain in the ...
Read More
/ IAQ Learning Institute

Recent Posts

Categories

Archives

Upcoming Events

  • No events