In article 47c162b8@qaanaaq,
Andy Hall writes:

- bearings and motor. This relates to the manufacturer and quality
of the product.

My experience of a few makes:

Manrose: Sleeve bearings, cease, motor burns out.

Deta: Sleeve bearings, cease, self-reseting thermal trip protects motor,
thus repairable.
(Don't think Deta exist any more. CPC used to do their range.)

Vent-axia: Haven't had one go wrong yet, so I haven't had to look inside.
Noisey (might be ball bearing -- they are not as quiet as sleeve bearings).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]