Zehnder ComfoAir 350 / 500 / 550

Find the exact model on the unit's front panel — for example ComfoAir Q350, Q450 or Q600, ComfoAir 350/500/550, ComfoD 350/450/550 or Zehnder EVO. That is the fastest way to match the correct filter set in our catalogue. If the label is missing, measuring the extract and supply filters directly identifies the right size just as reliably.

Zehnder ComfoAir units use two filter classes:

• G4 (ISO Coarse) — protects the heat exchanger; used on the extract side
• F7 (ePM1) — for the supply air, capturing fine dust and pollen

For most ComfoAir models we stock both a G4+F7 set and a G4+G4 set. The G4+F7 set is the better choice for allergy sufferers and homes near busy roads.

Yes. Swedish is an official language of Finland alongside Finnish, and this shop runs in Finnish, Swedish and English — which matters for customers in Ostrobothnia, the Turku archipelago, coastal Uusimaa and Åland, where Swedish is the everyday language. Write to us in whichever of the three suits you best. For a ComfoAir unit the most useful things to send are the exact model code from the front panel — the range covers 70, 160, 180, 200, 300/375 and 350/500/550 as well as the newer Q models, and the filter sizes differ across it — or, if the label is unreadable, the dimensions of the old filter in millimetres.

Because ComfoAir's F7-class supply filter is specifically designed to capture fine airborne particles including pollen, it can load up faster during spring and early summer than during the rest of the year. Checking filters monthly during peak pollen season, even within the standard 3–6 month replacement window, helps maintain steady airflow and allergy protection.

Yes. The ComfoAir Q350, Q450 and Q600 — and the ComfoAir E350 — all take the same filter set, available as G4+F7, G4+G4 or an activated carbon version. Older ComfoAir models (70, 160, 180, 200, standard 300/375 and 350/500/550) each take a different size, so check your model on the front panel before ordering.

On the ComfoAir Q range the reset is done from the control panel or the ComfoControl app, in the menu that shows filter status; on the older ComfoAir models (160, 200, 350, 550) it is a button sequence on the unit's own control, described in the manual for your model. It is worth doing immediately, because the reminder is a runtime timer rather than a measurement of how loaded the filter actually is — if it is not reset, the next prompt lands at the wrong point in the cycle and you end up either changing too early or running well past the interval. Do it while you are still standing at the unit, right after refitting the panel.