CamTarn is entirely correct, they are for ventilation.
is a constant battle between the needs of the inhabitants
), and the needs of the building (ventilation
are not ventilated
, they will quickly rot
. If rooms are not ventilated, the moisture you give off
will not escape, and the walls will sweat
, and the wallpaper will go mouldy
and fall off the walls.
If you have a gas fire
in your room, and it can't get enough oxygen, it will produce carbon monoxide
as a by-product, which will prevent you from enjoying it's warmth for very long.
Overall, you need ventilation all over your house (grates between rooms), and airbricks
to the outside world. However, they should be placed so that draughts
do not cause a problem. If you're ventilating a fire, have the vent on the wall or in the floor near the fire, so that the draught has a minimum distance to travel.
are ideally placed in places where the vents are, since the cool air
will be warmed immediately, rather than travelling across the room before heing heated.
The advantage of vents is that you can place them where it's convenient
for the required ventilation, and you can then block up all unwanted draughts (for example, those from under doors
and around windows