I am reading about RMHs for 3 months and I got basic items to build one in my basement. But I've got a problem. In my house I have a built in chimney with only 5"(13 cm.) diameter. I am living in Ankara, located in Turkey. This dimension is the standard for the diameter of the stove pipes in my country. It is very easy , and cheap to get 5 meters of stove pipe in my country. But for example steel pipes with 20" or 25" diameter are pretty expensive. As an addition my built in house chimneys input is in really nice position for my future RMH. I am gonna build the RMH according to well known book of Ianto Evans&
Leslie Jackson with the title "Rocket Mass Heaters:Superefficient Woodstoves YOU Can Build"
. In that book , it is declared that,
C should be the tightest part of the
intestinal system. The size of the cross
sectional areas of all parts of the stove’s
internal ducts or intestines should never
decrease below that of C. In other words,
the cross sectional areas of F, G, H, J and K
should all be greater than that of C.
Here, C is the area of the horizontal burn tunnel,
normally made of brick, in which most of
the burning happens and K is, K is the exhaust, the horizontal
flue that carries hot gas through your floor,
heated bench, bed etc. This should be at least
the size of the heat riser (8" to 10" diameter, my heat riser will have a 7 square inches cross sectional area )
or it could be made of more than one duct,
totaling a much bigger cross sectional area, as
for instance, if you’re using it to heat a floor.
But I've seen some pics on the internet that are showing some people using standard , relatively narrow stove pipes looking like having the diameter equal to standard stove pipes which are sold in my country for the exhaust.
I would like to ask just, what happens if I use that kind of stove pipes with the diameter of 5". No chance? It takes some money and energy to try and to see. Do you have any experience with that kind of stove pipes?
Thank you very much...