Bathroom extractor fan

that would certainly happen if the door had been left open.

If the door and window are shut, as is necessary for correct operation of an extractor fan, another factor comes into play.

Water vapour is lighter than air, and rises (hence clouds). The cooler air, entering under the door, will stratify beneath it. So, in still conditions, the warm moist air will rise to the ceiling and be sucked out by the fan, and the cooler, drier air will fill the room like pouring water into a bucket. Or like hot water in a hw cylinder collecting at the top, with cold water beneath it.

I don't know if the OP took my tip about closing the window.

I hope he hasn't been showering with the door open.
Sponsored Links
Good to know, thank you.

I'll give it a try with the window shut and if needed look to move the vent to close to over the shower.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links