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Technical Bulletin – Retrofitting HEPA Filters to Fan Coil Units

Technical Bulletin – Retrofitting HEPA Filters to Fan Coil Units
Jaime Graymead
December 19, 2022

In response to the Covid-19 pandemic, we are regularly being asked about how HEPA filters can be retrofitted to existing fan coil units.

Unfortunately to retrofit a HEPA filter into any existing ventilation system is not as simple as many people hope!

Systems not originally designed to support a HEPA filter do not usually have a suitable fan installed for the extra resistance, or a suitable filter holding mechanism for the Highest Efficiency filters

Fan Coil Systems

The fan in a standard Fan Coil System will not be designed to take the high additional resistance to airflow that a HEPA filter demands. The installation of a HEPA could result in a significantly reduced air flow, or worse still a burn out fan, or frosted coil.

Standard Fan Coil Systems often have a low grade pre filter installed to protect the coil. This filter is usually a very thin filter, making it almost impossible to upgrade due to space limitations, and lack of suitable filter alternatives.

Is there anything that you can do?

One option for the addition of a HEPA filter to a fan coil system could be to use a boost fan to overcome the additional resistance, and to house the HEPA filter externally.

This can be done with the Airclean HEPA air Purifier, or one of our Fan Filtration system.

FAN COIL SYSTEMS – Scenario 1 (Restaurants, Offices)
The HEPA Air Purifier can be mounted in a room and ducted to supply fresh clean air to the inlet of the existing fan coil air conditioning unit.
The fan in the Air Purifier allows the system to be balanced, allowing existing fan coil fans, to operate normally.
The Fan + Filter Unit can be mounted in the ceiling void supporting an existing fan coil, or air handling unit, to improve filtration.
The fan within the Fan + Filter Unit removes any additional load on existing equipment.

As installation of a boost fan needs to be carefully considered to ensure the boost fan is balanced with the existing mechanical ventilation. Contact our team to discuss your requirements.

If you would like to find out more contact the Airclean Team at sales@airclean.co.uk or call 01622 832777