balanced flues

Is this a gas, oil or solid fuel boiler?

My own (non-expert) opinion would be to go with a balanced flue. Over 20 years I have had problems with Corgi guys (and BG) challenging my ventilation. Standards may have changed since original installation and I had to bring in some extra ducting of air. Always an issue for me.

I had a CORGI guy challenge the ventilation for my old room sealed boiler. He also reckoned it shouldn't be mounted on a wood floor as it was a fire risk. But it conformed in both ways to the maker's installation instructions. Basically, he was a con artist.

Sorry I forgot to mention, it's oil, though I don't think Grant make any thing else. Does it make a difference? I've never quite understood how the air gets into the boiler "conventionally" considering the boiler is enclosed on all four sides with enamelled sheet metal, insulation, etc.

I presume the xxxx part is a number. I suspect installing the fan to the BS is not the issue, except that it will probably tell you to look up something else (often the manufacturer's information) if there are any open-flued appliances in the vicinity.

The guidance in Approved Document J is, "For oil appliances: limit fan capacities as described in OFTEC Technical Information Note TI/112 and then carry out flue draught interference tests as described in TI/112". So a copy of that OFTEC note may be your best bet.

But I think you need to be OFTEC registered to view their notes. Does anyone have a copy?

Thanks.