Negative and Positive Pressure

Negative and Positive Pressure Options

As all our lives have been changed since the COVID-19 pandemic arrived, many of our clients are looking for ways to implement preventive measures that will reduce the risk of viral exposure and spread.

One of the best places to start when considering this is your HVAC system. Installing an inline Hepa filtration system effectively removes 99.99% of particles, including particles as small as .3 microns. That’s the like filtering something 300 times smaller than a human hair! This level of efficiency ensures that as contaminants become airborne and are routed back into your HVAC system they are effectively removed before the air is recirculated back into your space.

For those looking for further prevention, and, especially those in the medical industry, there is a way to take this one step further: by creating a negative pressure room or a positive pressure room. These rooms are used as a way to isolate a space and prevent cross contamination while maintaining a high level of sterilization.

A negative pressure room maintains low pressure to allow outside air into the room, thus trapping potentially harmful particles within the room and continuously exhausts them. This effectively minimizes exposure to everyone else outside the room to these particles. In addition to this, it helps minimize exposure to the airborne particles to anyone within the room by constantly exchanging the air with new filtered air.

A positive pressure room maintains high pressure within the room as opposed to the pressure outside the room. This form of pressure balance ensures that air can leave the room and does not allow airborne particles from surrounding areas to circulate back in.

Implementing these types of systems requires using specialized construction and climate control. Ideally, the system should be designed to provide a minimum of 12 airflow changes each hour to allow the system to work effectively. In addition to the air pressure design discussed above, along with the Hepa filtration provisions are made to adequately seal the room (we have permanent and temporary systems for this).  Fans and ducting may be added to move the air as needed, as well as periodically monitoring the system and making adjustments on a quarterly basis. Upon request, we can additionally implement a UV radiation system to further create a sterile environment.

If this is something you are considering for your space, weather it may be due to staff concerns, patients, or you are simply looking for an effective way to minimize exposure, please do not hesitate to reach out as we offer free design consultations and are readily available to answer any of your questions or concerns.