I`m looking at using two inline fan kits:
to ventilate a bathroom and utility room that are next to each other (both
have no other forms of ventilation or windows).
What I was wondering because space is tight getting to the outside wall is
if I could join the two 100mm ducts into each other using a 'T-piece' or
similar like the one here:
Is this permisible (it must be otherwise they wouldn`t sell a T-piece
If one fan was on & sucking air through to the outside, would some of it not
end up going the other duct and end up in the other room or do the fans have
some inbuilt 'non return' for reverse air flow?
You can get backdraft shutters that are supposed to act as one way
valves. I have seen them in the RS components catalogue. Perhaps two
outlets, each with a backdraft shutter would be good.
Single fan with two suctions would mean only half the flow rate from
each, which might be a bit disappointing in clearing the room.
Also don't forget to try to keep the ducts warm, insulated over the
top, to avoid condensation dripping back when it is cold outside.
Also run the ducting slightly downhill to the outside if possible.
Will you ever run both together ?
If they're only ever used in isolation, then just use two backdraft
shutters, one between each fan and the Y or T.
If they're used together, then run two separate ducts (which isn't
that hard, especially with rectangular duct - most of the work is
always in making the holes. If you try to join the two ducts with the
T, then unless the flow is perfectly balanced (strictly the pressure)
one of the fans will provide minimal flow or may even reverse. If you
can arrange identical ducting, then you might get away with it.
Again, if there's a risk of the wind causing a pressure difference
across the two rooms, fit backdraft filters. You'll also need the
filters if one fan will be run on its own.
A better option is to use one fan on the shared duct and put the T on
the inlet side. Use an adjustable grille (or the pipe length and
diameter) to balance the flow as needed. Use a pair of backdraft
shutters again, if there's any chance of wind-blown drafts between the
Its also a strange fact that best flow is from anrrow inlet, big ehaust,
so I'd want to have a BIG pipe after the Y, and as others have said, run
one fan off either switch. Probly need a relay.
I'd suse a big fan big pipe and twin smaller diameter inlets to it.
No I wouldn't. I'd take it on the chin and use two setups. :-)
In teh ned, its easier.
Andy Dingley wrote:
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