Duct connection

I apologize in advance for using the wrong terms. I haven't been able to find pictures or read descriptions about how the ducts in the mass part of the RMH actually connect to the steel drum, where all the heat comes from. Is it so painfully obvious to everyone else that it never needs mention? Where can I find this info?

Thanks much,

Karl

Karl Franzenburg : It seems I owe you a Private message ! Let me try to set things right !

You need to go to Rocketstoves.com to download your PDF Copies * of the New Third Edition of Ianto Evans' Great Book '' Rocket Mass Heaters ''

This is " The Book '',Nothing else you can buy TODAY has as much information, It will save you Time, Money/materials, Effort, and Frustration,

while giving you exactly the information on figuring Sizes. shapes and orientation of the parts to themselves and the whole, and allow you to

see the art behind the simple core values of its Constant Cross-sectional Areas C.C.-S.A.(s) and the Group Ratios of the Feed Tube , Burn

Tunnel And Heat Riser ! Disclaimer, the people at Rocketstoves.com are friends to me, you, and all Rocketeers. And I am not Paid anything by

them !

When you come back to these pages, you will be confident that you are using with basic understanding the same words for the same parts as

everyone else ! The math is all 4th grade level stuff !

A specific answer to your question is usually that area called the Manifold or Transitional zone #is ether hand crafted with bricks and cob or if

the builders skill set allows is crafted out of ductwork or purchased at a H.E.V.A.C. Dealer ! //// See 2nd and 3rd pictures in link below :


http://thehouseonhilltopfarm.blogspot.com/2011_06_01_archive.html


They can be attached to the side of the barrel O.K., or the bottom usually better and should be generously sized !


This is where I warn You about the Huge Boat loads of Crap videos on You-tube Showing "Flaming units of Mass Destruction'' being passed

off as Rocket Mass Heaters RMHs.

Now , A public apology, I had promised you an earlier P.M. and my record shows that If I crafted such a thing it was never sent to you !

This has never happened before, and hopefully will never happen again ! I am attaching a link to your original post here.

see link Below :


https://permies.com/t/42785/rocket-stoves/RMH-central-Iowa

I will ask a moderator to post your original post to the forum for your regional area which should generate messages on local RMHs


I hope THIS Message is timely and useful, for the good of the crafts ! Big AL

* One to use, One to lose, and one to have for your library and only lend to close friends - all the same price !

#where the Rapidly falling cooler and dense exhaust gases are channeled through a 90º turn to flow Horizontally though the Thermal mass !

Good question, to be thinking about that area. Many people don't think about the transition.

It is commonly known as the "manifold", and should be shaped so that air can flow smoothly from the ring inside the barrel to the duct. As there are numerous possible orientations of the duct, there can be no one best manifold design, but in general you want the beginning of the manifold at least two times the cross sectional area of the duct, tapering smoothly to the duct size and shape. A search on "manifold" should get you lots of discussion of this area.

Karl Franzenburg : A few more links to make both your Searches and your posts more powerful and rewarding ! ///// See links below :


https://permies.com/t/43625/introductions/Universal
https://permies.com/t/34193/tnk/permies-works-links-threads

I hope you find this helpful and still timely enough! For the Good of the Crafts !

Big AL

Following what Glenn said.

You can also call that the plenum, or the flue transition. If this can help.

Karl, one straight forward way to construct the manifold is by using a second matching barrel, cut approximately in half, to serve both as the exhaust connection point and as a base for the full barrel. The full barrel is band-clamped on top of the 1/2 barrel, using an appropriate seal (like fiberglass wood stove door gasket rope held in place with high temperature aluminum tape, and the barrel's band clamp over that) . There are lots of photos of such beginning on this page:

https://permies.com/forums/posts/list/1000/26232