Ducting air flow from extractor fans

17 Apr 2007
Reaction score
United Kingdom
I have fans in the en-suite and main bathroom, both which I've discovered just vent into the attic.

If I were to connect both to a roof vent, would this T be suitable?
I'm concerned that the extracted air from one fan will be ducted across to the other as well as going through the roof vent.
Sponsored Links
I'd say separate duct runs to external, or at the very least NRV's to prevent the re circulation of exhausted air. Condensation could also be an issue, you dont want water going back into the other fan that isnt running.
So really, horizontally run duct pipes with air/condensation extracted through the gable end wall, each fan having its own pipe.
Sponsored Links
Yes, if thats the best way to run the ducting. Ideally on a constant slight fall to the exit, to allow any condensation to drain to outside.

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