On Apr 15, 12:02*am, sm_jamieson wrote:
But you'd have thought they would put something in
the manuals to explain whats going on

I think they should say "suitable for domestic cooking use only,
prolonged exposure to steam may reduce the life of your new widget-&-
co cooker hood and is not covered by warranty".

Most extractor manuals say "do not install directly above a hob or
cooking appliance", re temperature & steam.

It does read somewhat peculiarly as you have found :-)