The need for an air brick in a chimney breast.

by **Vikingboy** » Fri Apr 18, 2008 3:15 pm

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.

by **welsh brickie** » Sat Apr 19, 2008 7:57 am

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.

by **TheDoctor5** » Thu Jan 22, 2009 10:16 am

Last year 64% of the questions asked in our forum were answered within our DIY project pages at www.diydoctor.org.uk/projects.htm The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money!