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COVID-19 and your filters

Posted on april 20, 2021 by admin in CFP News

Can the virus that causes COVID-19 be transmitted through the air?

There is a potential for contamination if the system is a recirculatory system so running systems on full fresh air systems is preferred and recommended.

Studies to date suggest that the virus that causes COVID-19 is mainly transmitted through contact with respiratory droplets rather than through the air.

You can find the WHO Q&A on coronavirus here.

Maintaining good air supply and exhaust ventilation throughout buildings is key.

REHVA advise that in buildings with mechanical ventilation systems extended operation times are recommended.

Change the clock times of system timers to start ventilation at nominal speed at least 2 hours before the building usage time and switch to lower speed 2 hours after the building usage time.

In demand-controlled ventilation systems change CO2 set point to lower, 400 ppm value, in order to assure the operation at nominal speed.

Keep the ventilation on 24/7, with lowered (but not switched off) ventilation rates when people are absent.

Customers of CFP are well placed to protect the working environment and your HVAC systems.

•   All our products comply with ISO16890, the most exacting standard for filters and are manufactured from synthetic materials which are inherently anti-microbial.

•   Anti-microbial products do not support bacterial growth

There are various options available to upgrade the specification of final filters, this can typically be achieved without the need for costly upgrades to the existing units but may require adjustment to your unit set up and may also reduce airflow.

At CFP we recommend following these simple but important guidelines:

•   Air buildings (open windows/doors) to allow fresh air in when practical.

•   Where possible, set your system to full fresh air and keep recirculation to a minimum.

•   It is considered good practice to regularly disinfect ventilation systems and coils.

•   Ensure correct filter change frequencies are maintained.

•   Thoroughly seal AHU’s and filter housings to eliminate any air or dust by-pass

Scientists are continuing to investigate and research Covid-19 and the information we have is updating and changing all the time.

We will continue to provide updates an new information emerges.

Your health and safety at work remains our primary concern and we hope this information proves useful.

We hope you find this overview helpful, there are various filtration options available and please do not hesitate to contact us to discuss what will best suit your specific needs and individual requirements. For more information,

Please follow the link to the REHVA site for detailed guidance:


The World Health Organisation (WHO):



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