A pair of Vent-Axia G4 grade filters for the loft mounted PIV units.
These will fit:
Vent-Axia Lo-Carbon NBR dMEVe HT 100mm (474497A)
Replacement Vent-Axia M5 Grade Filters for PoziDry & PureAir PIV Range (477957)
Vent-Axia 125mm to 90mm Reducer (408885)
Vent Axia Low Carbon NBR 100mm Round DMEV Extrator Fan (498096)
Vent Axia Sentinel Kinetic Wired Remote Controller (443283)