Hi,
Not sure if this is the right place to be posting this but here goes...
I have an old pit house which used to be coal powered years ago. since then a gas central heating system has been put in place.
In the living room and bathroom there are air vents, large, almost square ones.
What are they for and can I cover/block them, because all they are doing at the moment is letting cold air in.
Thanks for your help
Jon