Two extractor fans in one room?

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7 Jun 2011
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I'm laying insulation between our ground floor and first floor and there are two extractor fan pipes running to the same location on the outside of the house (see first pic) and which both appear to be running to the same location in our house (above the downstairs toilet).

In the downstairs toilet, there appear to be two extractor fans on the ceiling (see second and third pics). Are these both extractor fans and if so, why on earth would there be two?

Finally, in terms of switches to control the fans (see fourth pic), on the outside of the downstairs toilet there are three switches -

the double switch socket which controls:-
the downstairs toilet light (left hand side of switch)
the hallway light (right hand side of switch)

the "Isolator" switch which doesn't work but I'd hazard a guess controls one of, or both fans?

All very odd!!

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The round thing is a vent/grille, not a fan in itself. In a normal scenario you would expect to see an inline fan somewhere along the ducting for this vent.

No idea why it's been done like that.
 
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Yes - quite possibly one could be air in and one air out, as the downstairs toilet has no external window.

How would we be able to determine whether one was air in and one an extra for fan - the grills on the outside of the house?

Reason for asking is where we want to lay insulation, whether we could robe one of the White poly tonnels or not.
 
External pic - seems to be same type of grill for each.

Have also had a look and doesn't appear to be any inline fan - although what should that isolator button be controlling?

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Find and fix the source of the draught.

And be prepared for increased condensation, mould problems etc if you do too good a job of sealing the place up.
 
Yeah we'll just need to air our house better once sealed.

Yep - isolator down and toilet light on, and fan still doesn't work.
 

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