We have just had a condensing combi boiler installed in the kitchen. We had a gas fire with a back boiler which has now been removed. This back boiler was situated within a chimney breast and flued up to the stack with a cowl on the top. The flue liner and the cowl have been left in place. We have been told by one builder that now that the chimney breast has been bricked up we would need an air brick in it to allow ventilation and prevent damp but another builder has said that we do not need an air brick with the chimney being flued and with a cowl fastened to it and cemented in place. We are now confused.
personally I would install an airbrick with a sliding vent (hit and miss) vent
Its easy to fit and its venting the flue.
If you dont fit it and you do get any damp you will have to fit one anyway
better safe than sorry.
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