Finland and Sweden: Order the spare parts from the Enervent webshop.
Elsewhere: Order the spare parts from a Enervent reseller nearest you.
When changing the filters the fan should be examined how dirty it is. The fans are removed and the fan wings are cleaned with for example a toothbrush or compressed air.
In case the reason of a service visit depends on a installation or usage error and does not meet Ensto Enervent's general warranty conditions, the client will be charged for the service work.