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Commercial HVAC, Preventive Maintenance Agreements

What You Don’t Know Can Hurt You: How To Keep Your HVAC System Contaminant Free

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Last Updated on April 30, 2019


When you think about the potential dangers that could threaten your building and its occupants, your HVAC system may not immediately come to mind. Many companies are prepared for natural disasters and terrorist threats, which, although potentially devastating, are statistically unlikely to happen. Yet companies fail to consider the much more likely threat of an accidental chemical or biological contamination spread through the building’s HVAC system.

With some advance planning and regular maintenance of your HVAC system, you can prevent many threats entirely and avoid the worst outcome from accidents.

What dangers could your HVAC system spread in your building?

Because your HVAC system circulates air throughout the building, it has the potential to spread many types of contaminants as well, including:

  • Viruses and bacteria
  • Mold and mildew
  • Fumes from chemicals being used in the building
  • VOCs that are released from many modern building materials
  • Smoke
  • Carbon monoxide
  • Asbestos
  • Refrigerant gas

The most common threats come from biological agents, which are almost certainly present in your HVAC system if you haven’t kept up with regular cleaning and maintenance. Viruses and bacteria can cause outbreaks of colds but also more serious illnesses such as measles, influenza, tuberculosis and Legionella. Mold and mildew growth, which are common when a building’s humidity is not properly controlled, will cause breathing difficulties in people with allergies and asthma, and can also cause skin problems. The growth of microorganisms in a building’s ventilation system can even spread a potentially serious respiratory illness called “humidifier fever.”

Contamination from chemical agents, including carbon monoxide and asbestos, are less common but often deadly when they do occur. If your air conditioning system develops a major leak, the release of refrigerant can cause skin damage, frostbite, and blindness and asphyxiation.

How do contaminants get in there?

Contaminants can be introduced into your system from a variety of sources:

  • Negligence and poor maintenance of your heating, air conditioning and ventilation systems
  • Droppings from rodents, cockroaches and other pests
  • Accidental chemical spills inside the building (a major threat in factories and laboratories)
  • Airborne contaminants from the surrounding area, possibly resulting from a roadway or rail accident, plant malfunction, or fire.
  • Natural disasters
  • And yes, even deliberate criminal or terrorist activity.

7 steps to keep your building safe from HVAC contamination

With so many potential threats, how can you keep your building, and more importantly, its occupants, safe and secure? Fortunately, there are some simple steps you can take to avoid contamination of your HVAC system. By properly planning your system’s design, and being vigilant about regular maintenance, you can mitigate the risks of HVAC contamination and prevent many dangers entirely.

  1. Start with the easiest solution and the one with a guaranteed impact: regular cleaning and preventative maintenance of your HVAC system. When you establish a service contract with an HVAC service professional, they will regularly clean your equipment, change filters, clean ducts and grates, and calibrate controls and devices that detect gas leaks. These simple actions prevent the accumulation and spread of biological and chemical contaminants in your system.
  2. Install HEPA filters, which prevent the spread of contaminants by trapping particles and keeping them out of the ventilation system.
  3. Install monitors with visual and audible alarms to alert you to high levels of toxic substances in the air, including carbon monoxide, VOCs, and other chemicals.
  4. Especially if toxic chemicals are used in your building, ask your HVAC contractor how the ventilation system can be engineered to help contain fumes in the event of a spill.
  5. Consider who is in your building, and where the most vulnerable occupants are located. For example, if you have children or seniors in the building, who are more quickly harmed by contaminants, pay special attention to the design and maintenance of the ventilation in those areas.
  6. If you have a building automation system that controls the systems and air flow in your building, make sure it is programmed to shut down parts or all of the ventilation system in the event of a chemical or infectious disease contamination.
  7. Determine where your system might be vulnerable to a deliberate attack, and take steps to secure those areas. For example, restrict access to the roof and wherever air intakes are accessible. Try to avoid air intakes at ground level whenever possible. Secure any areas of your building where HVAC equipment is located.

None of us likes to think about the dangers we might face, so we often neglect preparation for the most likely threats of all. How many of us worry about dying in a plane crash, but then fail to wear a seat belt in a car? It’s those small actions we do day in and day out, like buckling up even in the back seat, that keep us safe and prevent disaster.

Keeping your building safe from HVAC contamination is no different. The planning and safeguards you put into place can help minimize damage in the event that the worst does happen. But the easy steps you take on a regular basis, such as cleaning and maintaining your system, have the biggest impact. Not only do these steps protect your building’s occupants from illness and discomfort, but they also give you the peace of mind that comes from knowing that you’re safe from the most common threats.

Interested in learning how investing in a service contract for preventative maintenance can keep your building healthy and also save you money? Download our white paper on HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure.


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