MVHR Filters

MVHR units need a filter on both the intake and exhaust side of the unit. A G4 (coarse) filter can be used ether side, but an F7 (pollen) filter is only suitable for the intake. The passivhaus requirement is for a G4 on the exhaust and F7 on the intake. Filters can be cleaned in between service intervals but will need to be change eventually! The filter change proceedure for your MVHR unit should be followed. This will generally require you to power down the machine.