Air Filter of Energy Recovery Ventilator


Due to COVID-19, people are more concerned with ventilation rate of air-conditioned area, such as 6 air changes per hour for restaurants.  Energy Recovery Ventilators (ERV) are increasingly installed at locations with high occupancy like schools to improve the Indoor Air Quality (IAQ) and to reduce the risk of spread of viruses inside classrooms and general offices.

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The ERV extracts stale air inside and then recover the cooling/heating energy to cool down or warm up the incoming fresh air. 

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Children,  the  elderly,  and  those with predisposed respiratory and cardiovascular  disease,  are  known to  be  more  susceptible  to  the health impacts from air pollution. While particulate matter is of a key parameter of  IAQ, the  ‘optional’ filter provided by  suppliers of  ERV is quite often a low-grade air filter, G3 – G4 to EN779 standard, which is rather not effective to block out fine particles like PM2.5.

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Particulate matter (PM) is a term used to describe the mixture of solid particles and liquid droplets in the air such as dust, ash, and sea-spray. Particulate matter varies in size, PM2.5 is also known as fine particulate matter (2.5 micrometers is one 400th of a millimeter). It is well known that PM2.5 is harmful to human health, which increases the age-specific mortality risk, particularly from cardiovascular causes.

The type and grade (filter efficiency) of the filter to be used should be depending on quality of outdoor air at the location where the ERV installed and the IAQ levels desired. 

Nanofil has developed a patent pending sterilizing nano filter media with electro-spinning technology, which has a high filter efficiency, low pressure drop and has the ability to kill 99.9% of bacteria of wide spectrum, and adsorb VOCs, odor and formaldehyde. 

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Nanofil is able to propose appropriate filtering solutions to our clients and provide customized ERV filter to improve IAQ.

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