My post is almost identical to this one http://www.diynot.com/forums/viewtopic.php?t=138331&postdays=0&postorder=asc&start=0 from a couple of years ago. As regulations seem to be amended every other day, it seemed more appropriate to raise a new post than to hijack an old one. The boiler is a Worcester Bosch 240 RSF. The boiler/central heating was already installed (I believe by British Gas) when I moved into the property over ten years ago. The cupboard housing the boiler always had louvre doors on, which were apparently fine until a few years ago (I forget exactly how many) when, whilst undergoing a BG homecare service, I was told that I couldn't have doors on the cupboard, so I took them off. My house has never been perfect but the boiler and inside the cupboard really aint that pretty to look at and it has caused a bone of contention ever since. Now I am currently in the process of sprucing the house up to sell it and, notwithstanding the fact that I suspect I'll be in the same situation with the boiler in my new house, I want to put some sort of doors back on so it doesn't look a chuff when people come around for a viewing. I'm happy to buy some more louvre doors for the cupboard or make some fretwork doors (which will be more holes than door,) but I'm worried about 'knowingly contravening the gas regulations' and selling on what would be considered to be an unsafe appliance. I had the last BG homecare service 2 days ago and the engineer asked if I would be putting doors on the cupboard and I answered 'no.' Regardless, I think that it would be pointless arguing with the engineer and they'd simply condemn the device if I put doors back on. Funnily enough the boiler has packed in working the day after the service and they'll be leaving me with no heating or hot water for 3 days until they can get another engineer out to me. Technical literature for the device can be found here Please login (registration is free!) to view this link. http://www.worcester-bosch.co.uk/installer/literature/discontinued-boiler-literature/discontinued-gas-boiler-literature/240-rsf-discontinued-december-1997-literature but I'm pretty sure that current regulation overrides this. Other than trying to establish exactly what the regulations say in terms of minimum cabinet size and airflow to the device, and then reconciling that against the surface area of ventilation on a fretwork door, I'm at a loss. It's a clearly ridiculous situation in my opinion if the doors are louvred or fretwork panels but what can I do? I'm not prepared to risk penalty to myself and I'm uncomfortable 'illegally' putting doors back on while someone view the property, knowing full well that they'll be forced to take them off when they have the appliance checked. What exactly are the regulations? What can I do if I think the engineer is misinterpreting or incorrectly enforcing the rules? Help/advice is very much appreciated.