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Rocket Mass Heater thru slab

 
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Has anyone tried using this to solve the draft issues,ie start up smoke, duct sizing problems. 

http://www.draftinducers.com/draftinducerinstall.htm

I am considering running emt(galvanized steel electrical conduit) in a concrete slab for the venting, maybe  20 runs or so-thats how the math works out- to equal the area of a 6" flue pipe.  16 runs of 1.5 inch is the same area as the 6" and I would add a few extra because there is more friction/resistance in smaller diameter piping. 
At the end of the run the emt would run back into a 6" vent and head up and out.

I poked around the archives but didnt come across anything with the same design.  Could someone point me to a thread if I missed it, or if this is the first looking at running the venting in a 3.4/4" slab, any feedback would be appreciated.

Yes, I will be getting the book.

Thanks
 
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