Thanks for the replies. I was mistaken about the adaptor it is only a
small gap of slightly less than one eigth of an inch all the way round.
I
have found the advice on fluesystems.com useful also as there is a live
on line 'chat' helpline. They say that the adaptor fits straight into
the
appliance hood and it is OK to drill fresh holes.
All I need to do now is contemplate whether it's worth the
risk....

Thanks again

Jon


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