Hi guys im after a bit of advice, im fitting a vertical Flue to an ecotec plus831 and cant find any guidance as to required distances from a ridge vent type flue, Im thinking for some reason 1500mm but I cant find any guidance to back that up. In the MI it doesnt give a figure for this scenario or for any open flue for that matter, it does state 300mm from any vent or opening horizontally. The new flue will be on a pitched roof and the best desired location would be 300mm horizontal and 330mm down the pitched roof from the ridge tile? To my mind I dont think it can go there.......... but it would make my life easier.