The scenario: a 1960s apartment with a windowless bathroom which looks a
bit like this
Not shown on this stock plan is a hollow column which is on the wall
behind the door hinge and goes from floor to ceiling and continues up
and down from basement to roof carrying services between the floors.
There is a ventilation grille in this column on the side which faces
away from the bath and the opening door. There has never been an
extractor fan in this bathroom and frankly the vent is insufficient and
doesn't do very much to clear steam or prevent condensation.
My intention is to fit an extractor fan into the column in place of the
vent and to insert a ventilation panel into the door to allow air to be
sucked into the bathroom from elsewhere in the apartment when the
extractor fan is working.
Any obvious pitfalls?
It's been suggested that installing the fan on the side of the column
facing away from the bath would be less efficient than installing it on
the side facing the bath. I'm not convinced it would make any difference
when the bathroom door is closed but putting the fan in the new position
would obstruct it when the door is open. If it were better for the fan
to face the bath I could easily fit a blanking panel over the vent and
cut a new hole for the extractor on the opposite side.
Clearly the column is intended to ventilate this and everybody else's
bathrooms but are there likely to be any problems resulting from forcing
damp air out in this way?
For the avoidance of doubt no building regulations apply since this is
all taking place in a country which has never heard of the things but I
want to do a good, safe and efficient installation in any case.