Ventilation Question

[Toppers]

In my new build extension we have a small utility room (1.8 x 1.2m) conjoined with a small WC (0.9 x 1.8m) BC have specified ventilation for each room (30l/s and 6l/s) both these will be in line with each other, what is the best solution to vent each to the outside wall on the end elevation, I would like to vent both to one outlet if possible due to limited space.

[ProDave]

I don't think connecting them to the same vent is allowed, you are likely to get air from one room blown into another. So 2 outside vents I am afraid.

[Dee J]

One inline fan, y-join, two anti backdraft flaps, job done.

[Mr Punter]

I have used the Airflow Icon fans in this situation as they can be switched individually and have different controllers (delay start, humidity, pull cord etc) depending on requirements.  They have an iris that closes when the fan stops so you don't get air from the other fan on the same duct run.