Ventilation for internal room

30 Dec 2008
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United Kingdom
I'm building a new kitchen. The old kitchen (which is tiny) will become a utility room but it will have no external walls. The only sensible access to the outside world is through the new kitchen or the downstairs loo. We won't have a tumble drier but will have a sink and washing machine in there.

From my reading of Part F if it were a new build I would need 30l/s of extraction. This bit is not new it is an existing room but I have made this room 'less satisfactory', although it had no vents or extraction other than a draughty back door. What would I actually need to achieve? Are there any clever ways to achieve this? The extension roof is slightly higher then the existing ceiling so any ducting will be visible or convoluted. Less of an issue in the downstairs loo, I suppose. Or can I just vent into the downstairs loo and have another vent in the loo to the outside?

One final question if 30l/s is a common requirement why are nearly all 100mm fans 25l/s?

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If it's only got a washing machine and sink, why bother with a fan. Just open the door to the kitchen or hall if necessary.
Tbh that was my first thought. We don't tend to close doors anyway, just concerned about whether building control would allow that. I will ask what they are happy with but I'd rather go in with a good idea first.
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1. Remove the door between the kitchen and utility so that the latter just becomes a 'nook' of the kitchen.

2. Get your certificate.

3. Put the door back.

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