[Coarse  & ePM2.5]

This is an alternative product suitable for the above unit. To ensure that your HRV filter works optimally, it is best to replace it with a new HRV filter once every 6 months. This is on average and may be more common under certain conditions of the environment. Check your MVHR filter occasionally: if the entire filter is discolored by the dust and the structure is no longer visible, the filter needs to be replaced. You can easily replace your HRV filters yourself.