Venting a redundant external chimney stack

Sandy7

If a bedroom with a redundant external chimney stack is blocked up internally, should it always have some sort of vent retrospectively fitted in the room? The chimney pot has a pepperpot fitted which will allow ventilation at the top of the chimney stack but I wanted to know if an internal vent should be fitted (should this be an airbrick?)

I am concerned that because the stack is on an external wall, the inside of the chimney will be very cold in winter and if I add a vent warm most air will be drawn up and result in condensation.

Just wanted to find out if I need to do any work on the chimney before the room is plastered.

Many thanks for any advice

TheCyclingProgrammer

If it's external could you not vent it outside?

cyclonebri1

The chimney pot and stack above roof levelcan come off. A simple vent to the external stack and also to the rooms internal fire place will be perfect