i certainly didnt get out the wrong side of bed . u just took affence to me saying get ur multi meter out and start testing for some reason either cause u dont own one or are to stupid to use such a simple device, then you decided to comment on spellings to make up for you own inadequacies...
all the best thinkers were dyslexic . i get on fine with my english skills . i wont ever be teaching english so i aint worried . however wat does worrie me is that an aircraft engineer cant fix a simple boiler . mmm interesting . wonder wat part of the airfix factory you work in . best bit of...
there would be enough air even with the door closed to carry on combustion other wise it would go out as pointed out . the reason you could get high levels of co is due to the reburning of the original products of combustion . a gas appliance burning correctly with the correct amout of fresh air...