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Small Shower Room Ventilation.

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I was talking to a developer this morning. His son is a sparks. The two have installed a new 4 inch ceiling fan in a small upstairs shower room that has no windows. The building roof has been renewed recently and new breathable "felt" installed under the tiles. I had previously mentioned that the roofers could install a new roof vent for the fan ducting, but nothing has been done about this.


The developer says that the son advises terminating the air duct in the loft onto a bucket to catch moisture, which I said was not acceptable.


Bearing in mind that the new roofing "felt" (membrane) is breathable, is there any reason these days not to terminate the air duct directly into the loft space with no external grille?


Z.
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    The reply box has changed again!!!

    These fueled appliances without inlet air vents are not permitted by the BR, and probably will not cause poisoning, but will not work properly if there is no airflow through the fuel and up the chimney. Burning fuel without enough air does not cause too much CO generation as the temperature rapidly falls, this is the regulation method on most enclosed stoves, they just burn more slowly. Making Carbon monoxide is not quite as simple as may be imagined, certainly, my stove makes none (as tested by me) except a tiny amount in the flue when well-raigned back.

    I have just had a thought, are the vents missing in order to get a good airtightness test, and a higher class of energy efficiency? All this shows a distinct lack of joined-up thinking by both regulations and policy, as usual! 

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  • 0

    The reply box has changed again!!!

    These fueled appliances without inlet air vents are not permitted by the BR, and probably will not cause poisoning, but will not work properly if there is no airflow through the fuel and up the chimney. Burning fuel without enough air does not cause too much CO generation as the temperature rapidly falls, this is the regulation method on most enclosed stoves, they just burn more slowly. Making Carbon monoxide is not quite as simple as may be imagined, certainly, my stove makes none (as tested by me) except a tiny amount in the flue when well-raigned back.

    I have just had a thought, are the vents missing in order to get a good airtightness test, and a higher class of energy efficiency? All this shows a distinct lack of joined-up thinking by both regulations and policy, as usual! 

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