Weston Hilton : Any D.I.Y. sub 6'' system is avery difficult first build, I would strongly recommend that you go to
rocketstoves.com to get your PDF Download of
Ianto Evans' Great Book
'Rocket Mass Heaters $15, with `100,000 rockets build world wide most were built following 'The Book' and 95% of the First time Builds
(that worked) were made following 'The Book', there is
STILL no other book in any language with more rocket stove family information! (and I don't make a dime!)
If you want more technical information about why Iron and Steel can not hold up to the combustion temperatures of
wood in a modern
Rocket Mass Heater RMH, I can
suggest going to>
Wikipedia to look up their article on
High Temperature Hydrogen attack , it even explans why pre and post theta treatment of cut and
fabricated steel is important ! For the Good of the Craft ! Big AL !