FIL D'AIR

Covid-19 : how to use your heat recovery system ?

source : ZEHNDER COMFOSYSTEMS

Can I continue to use my ventilation system as usual?

Yes! Viruses are mainly transmitted by contact with respiratory droplets over a distance of 1.5 metres. Transmission through dual-stream VMC systems may be excluded based on current knowledge.

Do I need to install specific filters?

No, viral particles are too small (smaller than 0.1-0.2 micrometers (?m)), even for the best HEPA (High Efficiency Particulate Absorbing) filters. These filters are used in healthcare environments (hospitals, laboratories, etc.). In the current state of knowledge of the virus, no professional is able to commit to the effectiveness of a specific COVID-19 filter.

What is the impact of indoor humidity ?

The moisture content in the ambient air can play a role in the lifespan of viral particles and the risk of infection. It is recognized that the risk of influenza virus infection is lowest when the humidity of a room is between 40% and 60%. It is not yet proven whether the recommendation is the same for the coronavirus.

Is there a COVID-19 risk in heat recovery systems?

Zehnder ventilation systems with heat recovery recover calories from the outgoing hot air and transfer them to the incoming fresh air. It’s calories that are recycled, not air.

The Zehnder exchangers allow a strict separation between the extracted air and the incoming air, thanks to their cross-flow plate exchanger. Incoming air cannot come into contact with surfaces in contact with extracted air.

The innovative technology of the ComfoAir Q range allows extremely low leakage rates at the exchanger (External leak: 0.38% Internal leak: 0.15% CAQ 350 NF 205 certification).

What is the best ventilation system in this sanitary context?

Using dual flow VMC rather than single flow VMC (new air goes in without a filtration system), allows you to have both:

Filtration of incoming air, limiting the entry of pollutants into the house. A double flow ventilation system with F7/ ISO ePM1 filters allows the filtration of fine particles (filtration on average of more than 50% of ePM1 particles, or 1?m) (3). It can be considered a reasonably effective protection. SARS-CoV-2 (Covid-19) particles are grouped into larger particles, which are, for the moment, in the efficiency zone of these filters.

It is also important to have a ventilation system without a recycling system. (Type of coolers, air scrubbers, etc.).

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