The objective of this CPD is for everyone attending to be aware of the principles that apply to chimneys and various linings that might be considered, not just in large and historic properties, but also with current technology. The question of restoring, rather than replacement of existing flues/ducts can then considered as a realistic option. A current problem exists with the costly and time consuming practice of replacing 'condemded' ventilation ducting, for example in commercial kitchen extraction application; which can be answered in this seminar with proposals that provide solutions. In summary, this CPD will offer an understanding of traditional knowledge and skills with how they have been applied using modern developments, to solve today's challenges, right upto ventilation, kitchen extraction and commercial heating.