"Yaz K" wrote
| I'm installing a ventilator fan in the bathroom but the location
| is causing a dilema. The outside wall is around 12 feet from the
| shower area so if I fit a wall fan, will it take be efficient at
| removing the steam caused by the shower? The alternative is a
| ceiling fan directly above the shower area but then will a 12 foot
| duct out to the wall / roof be too long?
The air flow will take the easiest route, so it depends on where the window
or door is, because that is where the air will come from that replaces the
air being extracted.
You should avoid air being sucked door > loo > washbasin > fan unless you
want bacteria-laden aerosolised shit from the loo being wafted over your
Points to consider:
1. If you mount a fan directly above the shower it may have to be a
low-voltage one to comply with the electrical Zones in bathrooms (google for
2. 12 ft of ducting is nothing for a half-competent centrifugal fan (one
designed for ducting, not the piddly little 4" axials the sheds sell) but it
may be harder to find one in low-voltage. If you have the space, you can
mount the fan part-way along the ducting. Consider noise/vibration.
3. If ducting, have the ducting slope away from the fan all the way, so
condensation in the pipe runs out (or install a condensate trap with drain).
My bathroom fan must go through about 40' of ducting.
4. Consider getting one with an integral humidistat.