Hi there, yeah the heater is a furnace ... is really good and warms quick. The pollen filter is odd, it's one of those that does not have one! ... have been to do it a couple of times (inc this Summer) and do the cut and shut routine but it does not have the dashed plastic or any means to get into it. Even bought one but seems be one of the very first models without facility to change it. can't be helping.
This one strangely has not been had since new but has bounced about between family members pretty much since new, so we know its pedigree ... good or bad as that maybe. It's only done about 80k so a relative baby still in miles terms, in years less so.
