These vents were there to serve either an open fire or perhaps a gas fire with a back boiler which drew their combustion air from inside the room.
If these appliances are no longer there, the vent can go.
John
hi yes thanks for info I have just blocked it with towel due to this cold weather soon as it warms up a bit I will take it off I just wanted to make sure now having blocked it
For sure, there's no huge hole in my lounge wall, and never will be..... These vents were for combustion purposes and were a requirement courtesy of the heating systems used long ago.
John
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