We're hoping to put a Stanley stove into our sun room. We haven't a chimney - but are going to build one up - Do we need to or can uyou just use a floo pipe?
yes but check out the regulations for it basicly use twin wall/insulated flue as soon as you hit the ceiling/wall or go outside and leave airspaces where required. The termination point of the flue in relation to the roof of the house and any extension is crucial in avoiding downdraught.