View Larger Image Twin wall system – central London Another nice central London install from Chimflue. Here we installed a twin wall system that we had specially painted to blend with the exterior of the building, to serve the apartment buildings three boilers. admin2019-09-17T11:12:55+01:00Feb, 2019| Share This Story, Choose Your Platform! FacebookTwitterLinkedInRedditTumblrPinterestVkEmail