My Central Heating boiler is in fireplace with flue going up and out of the
existing chimney.Had a surveyor recently regarding cavity wall insulation
and he said that I should have an air vent in the wall of the room where the
boiler is.Although, because of my age, I get this done for nothing but I am
not too keen on having wall drilled and a vent put in.There is a vent in the
floor of the room and of course a number of vents in the foundations.Can
anyone please advise me on this.
There is always the possibility of some future occupier covering the
vent in the floor and killing the occupants. A wall vent is much
safer. An alternative is to put a vent in the door and have the air
supply from another room or outer door
best thro wall but i believe the floor type are still allowed although there
was talk of doing away with them due to radon gas. i see many back boiler
with fires where the customer has had insulation fitted and the new vent is
thro the wall with the original in the floor. they are covering their selves
by putting the new vent in as they cannot be sure the existing air bricks
under the floor do not become obstructed by the insulation as they are not
ducted between/thro the cavity as the new gas vent will be
I did wonder why Surveyor was so keen for me to agree on a new vent,so there
is a possibility that all the other vents in the house could be blocked up
with insulation foam?House was built in 1968 and there are quite a few
underfloor and wall vents and I have to say that I have never seen these
things that are not on a wall so I dont know the construction of them.Looks
like I will have to get new ducted vent.
Thanks all for replies
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