Molecular filters in ventilation systems: Keeping harmful gases out
People spend over 90% of their lives indoors: at home, in offices, pre-schools and schools, gyms, movie theaters, restaurants, and so on. Indoor air quality is paramount in making sure we stay healthy. Heating, ventilation, and air-conditioning systems (HVAC) can transfer a range of pollutants present in the outside air indoors. Choosing the right air filters is crucial here—according to Eurovent 4/26-2024, there are many decisive factors, but most important is the quality of the outside air respective to the pollution in it.
Which filtration types are there, and when are molecular filters the best choice? Gas filtration vs. particle filtration
Pollutants in the outside air can be divided into two main categories:
Regarding air quality, different filter systems are required to filter aerosols and gaseous contaminants. Particle filters—usually fiber filters—can only separate particles from airflows in ventilation and air-conditioning systems. However, invisible gaseous pollutants pass through these particle filters unhindered.
Special molecular filters are used to prevent harmful-yet-common gases in the outside air—such as sulfur dioxide (SO2), nitrogen oxides (NOx), ozone (O3), and volatile organic compounds (VOC)—from penetrating the inside air via HVAC systems. Molecular or gas filtration can be used to remove the smallest of contaminants from the air by using specific technological processes.
MANN+HUMMEL prefers to use activated carbon as an adsorbent for molecular filtration. Thanks to their vast internal surface area, gases can accumulate as a result of Van der Waals forces (i.e., attractive forces between two molecules that spontaneously form dipoles).
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