Cone Filter for Exhaust Air 20 Pieces Cone Filter DN 125 G4 Cone Filter for Ventilation System Zehnder, Helios, Nibe, LWZ, Wolf, Stiebel Eltron, Vallant, Maico, Pluggit Exhaust Filter

Having installed an MVHR ventilation system in my son's house & having seen the insides of other various installed ducting systems I thought I would try these to keep things cleaner. For my needs, the system only has three stale air exhaust vents, so a box of 20 will easily last more than a year.The photos show the kitchen area one after about three months & it is plain how much dirt is in the air. It is clearly doing it's job as the ducting inside is spotless & the photos of the two main unit filters (the oblong filter photos) also show that they work - the dirtier one from the fresh air into the house & the cleaner one is within the main unit that draws air from the three stale air exhaust vents.In summary they are perfect for keeping the ducting cleaner & the actual heat recovery unit.When installing they fit around the lip of the removable part of the ceiling valve / vent, which when reinserted holds it in place. When changing make sure the system is turned off, otherwise, if on boost, they can be drawn up into the ducting.I have not noticed any drop in performance or any measurable difference in airflow when measured. A great bit of kit.

Pour mes bouches à extraction d air (VMC).Très fin pour des G4. Bon je suppose que ça fait son job mais il faudra les changer plus souvent ou je mettrais ceux là au wc et buanderie.

Cumple su cometido

Wir wohnen an einer Hauptstraße und seit dem wir den Filter haben ist viel weniger Staub in der Wohnung

Gutes Produkt

Leider sehr labrige form.