To disinfect large spaces like factories, warehouses, offices, and cinemas, using ozone generator to release ozone into pipes of the HVAC system is an effective approach.
How the Ozone Generator Works?
An ozone generator is installed in the main air duct or after the filter in the air handling unit. The control panel is placed in the equipment room. During disinfection, the fresh air and exhaust dampers are closed, allowing the air to recirculate within the building.
The ozone generator can be set to run automatically at a fixed time each day, usually for about 1 to 1.5 hours.
Benefits of this Method Include
Ozone is evenly distributed through the HVAC system, ensuring full coverage in enclosed spaces.
It effectively eliminates a wide range of viruses, bacteria, mold, and even stubborn pathogens like Clostridium botulinum.
It also helps remove odors and inhibits mold growth inside the HVAC system, which can extend its lifespan.
Unlike chemical disinfectants, ozone leaves no harmful residue—it breaks down into oxygen naturally after use.
It’s a simple, eco-friendly solution with no pollution risks.
How to Use Ozone Generators in HVAC Systems Effectively？
- Select the Right Amount of Ozone
Getting the ozone quantity right is crucial for effective disinfection. Use this straightforward formula:
W = 1000 × V × N × S
– W: Ozone output needed per hour (mg/h)
– V: Volume of your space (m³)
– N: Target ozone concentration (mg/m³)
– S: Natural ozone loss over one hour (61%)
For example a 1500 m³ area would need about 75.5 grams of ozone per hour. An 80 g/h ozone generator would work well here.
- Optimize Disinfection Speed
Factors that affect the efficiency of ozone disinfection include air humidity, ozone concentration, and air temperature. Research has shown that the higher the ozone concentration, the faster the disinfection speed.
Higher ozone concentration speeds up disinfection. For instance:
At 1 ppm, it takes 90 minutes to eliminate 90% of bacteria.
At 0.5 ppm, it takes 120 minutes.
At 50 ppm, it takes only 20 minutes.
Higher humidity and temperature also help ozone work faster.
Therefore, adjusting indoor temperature, humidity, and ozone levels can significantly improve disinfection efficiency.
- Remove Residual Ozone Quickly
After disinfection, it’s important to eliminate leftover ozone safely and efficiently.
You can use the HVAC system to increase indoor temperature and reduce humidity, which helps ozone break down faster.
Combining ventilation with photocatalytic air cleaning can also speed up the removal process and improve indoor air quality.