There are many paths to reducing risks associated with the transmission of COVID-19. Infection control is about reduction of risk, not elimination of possibility. A broad, systems approach, with purposeful redundancy, is required. HVAC is just one part of the equation.
We’ve seen much focus on using social distancing to limit airborne transmission by expelled droplet nuclei between people in close proximity. That is an important measure. However, droplet nuclei quickly get smaller and may also stay airborne long enough to be entrained into the HVAC system. To prevent it from becoming a means of distribution, MERV 13+ filtration is being recommended by ASHRAE, as well as other measures, such as UVC. Dynamic has a range of systems that can help in the fight against COVID-19.
The Dynamic V8 provides MERV 15 performance, with lower pressure drop and a far longer service life than passive alternatives. In the normal course, the Dynamic V8 has many advantages over passive filters. It is widely used as both a retrofit and in new construction in critical applications such as laboratories, healthcare, military installations, and art museums. In the current situation, the Dynamic V8 has several specific advantages:
Like all Dynamic polarized-media air cleaners, the Dynamic V8 uses an active, non-ionizing, DC voltage to create an electrostatic field that polarizes both the media fibers and the particles in the air. This gives Dynamic Air Cleaners the ability to agglomerate and collect ultrafine particles. For example, in an in-situ test in an urban environment, a Dynamic V8 Air Cleaning System in a commercial building yielded indoor levels of ultrafine particles (0.015-0.1 micron) that were 92 to 99% lower than outdoor levels.
UVC has been used for decades to inactivate molds, bacteria, and viruses in air and water. Most UVC in HVAC applications is optimized to inactivate biologicals that might be on the surfaces of coils and in drain pans. Dynamic Sterile Sweep® UVC Systems couple high output 254nm UVC lamps with translucent glass media in Dynamic Air Cleaners, in a “Catch, Hold, Kill” configuration optimized for airborne inactivation. This provides the necessary contact time for UVC to work. 90% of captured bacillus subtilus is inactivated after 5 minutes, and 99% after 20 minutes. These systems were part of the Anthrax clean-up at the U.S. Postal Service and continue to be the basis of design in many Federal mailroom applications. More commonly, the Sterile Sweep and 1” or 2” V-Banks are used as a frequent pre-filter for Dynamic V8s in hospital applications.
Again, infection control is about reduction of risk, not elimination of possibility. A holistic approach may include:
Dynamic Air Quality Solutions has been designing and manufacturing air cleaning systems for over 35 years and is known for high-efficiency air filtration with low pressure drop—allowing for retrofit into air handlers that might not have the fan horsepower for high-efficiency passive filters. The company also offers germicidal UVC systems. Both product lines have been used for decades in high-impact medical, laboratory, and pharmaceutical applications.
We are committed to doing everything we can to help fight this pandemic.
ASHRAE Building Readiness Guide 18 Aug 2020
Yes, the Coronavirus Is in the Air by Dr. Linsey C. Marr, The New York Times 30 Jul 2020
Hygiene Theater is a Huge Waste of Time by Derek Thompson, The Atlantic 27 Jul 2020