Microbial growth in your HVAC system can reduce energy efficiency and contaminate the air in your building. Inside the HVAC system, it is often cold, dark, and wet providing the perfect environment for mold and other microbial organisms to grow. Any spores or particles released into the airstream below the filters will go directly into the air you breathe. In the aftermath of COVID-19, you might consider adding a disinfectant coil cleaning solution to your preventive maintenance plan.

Somewhere in your system, there are fans blowing air through the ducts. Anything in the pathway of this air is going to cause resistance. Pressure drop is the impact of this resistance on the flow of air through your system, and air filters can directly impact this.