Venting two bathrooms

[Geoff Pearson]

I have two bathrooms, one above the other which makes plumbing very easy. I am planning to refit the upper one which has a large roof light with ventilation slots (1897 method) and it needs no ventilation but I expect someone will say I should fit a fan. Downstairs is a shower room which never steams up - large slow fan blowing away under the floor to the back wall of the house)

I am thinking of fitting a fan system for both rooms, venting through the roof. Can I use one in-line fan for both with inlet pipes from both rooms; do I/should I use one fan for each? What can I do to avoid one blowing into the other?

Has anyone done something like this?

Geoff

[Lobster]

I did look into doing it once; I found that BES did various bits of ducting featuring one-way flaps, which is what would be needed. I imagine it would clobber the airflow quite badly though.

David

[Tim Watts]

You could, but you'd need to vaguely balance the flows.

[Geoff Pearson]

I'm not sure what "balancing" would mean. It is not likely they would be on at exactly the same time. In fact, I would probably not run the upstairs one at all as it has ample natural ventilation.

[Tim Watts]

I assumed you meant one inline sucking from 2 ducts, one to each room?

If so, there is a chance one room could get a poor share of the suction unless you make an effort to balance the flows.

This is done in commercial systems partly by design and tweaked with adjustable dampers.

[JimK]

/ Tim Watts

-show quotedtext -I assumed you meant one inline sucking from 2 ducts, one to each room?

If so, there is a chance one room could get a poor share of the suction unless you make an effort to balance the flows.

This is done in commercial systems partly by design and tweaked with adjustable dampers./q

I have an unashamedly cheapo version with one inline duct fan sucking on two screw in/out adjustable vents, 1 in each room. Fan is on own timer wired to come on with either light.

Parts from various on ebay IIRC. Works fine tho cheapo fan is a bit rattly/noisy now, simple to swap out tho.

Jim K

[Geoff Pearson]

I see what you mean - thanks.