Like a lot of people nowadays, I'm fitting a log fire into the back of a camper van but can't find the minimum height above the roof for the chimney. Ideally, it should be as low as possible for aerodynamic and roof clearence purposes.
Building regs state that the pipe should be 2' above the highest point on the roof and I've seen people blindly follow this with their conversions (which is ridiculous) but nobody says why. Air flow? Safety for thatched roofs? The most recent paper I've found on the subject was published in 1946 and doesn't address this issue.
The venting for the stove is entirely different anyway with a 30cm cubed combustion chamber, a 130mm internal sized flue, a 500cm straight pipe to the roof and a 3-5Kw output.
Is there some formula for a minimum chimney height above the roof? Or a university compartment specializing in combustion?