Win a copy of The Prairie Homestead Cookbook this week in the Cooking Forum forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • Pearl Sutton
  • James Freyr
  • Mike Haasl
  • paul wheaton
  • Dave Burton
stewards:
  • Joylynn Hardesty
  • Jocelyn Campbell
  • Joseph Lofthouse
garden masters:
gardeners:
  • Carla Burke
  • Steve Thorn
  • Eric Hanson

Ducting in pebble mass

 
Posts: 8
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I just (mostly) finished watching all of 4dvd set ‘bwh’  It was awesome. But somehow I either missed or didn’t hear what the duct piping is inside of mass. I’m assuming I can’t buy hibachi ducting from Home Depot, but stove pipe seems like over kill. I read someone suggesting aluminum. Where would one buy that other than online?

https://www.google.com/search?q=6+aluminum+pipe+duct+hvac&sa=X&rlz=1CDGOYI_enUS774US774&hl=en-US&biw=375&bih=591&noj=1&tbs=vw:l,ss:44&tbm=shop&srpd=4866792618927279527&prds=epd:6874571121997822976,paur:ClkAsKraX-_yZqE2TfOZF-EGUv80RZOBodB8LYAdnUKjEFDKwL5H_L22CJxUfraNJ2rWwqXSIeZbWYI3rB6fcYIxduCB1YdRQjImQ6AX-BSDYFk57P4slAZU8BIZAFPVH72UQvQX2p5DWT5DxS9QIOsCG0VasQ,cdl:1,cid:15736563221099844753&ved=0ahUKEwiTwKvCn_LYAhXP0FMKHQeaCjUQgTYI1gQ

Could I use this flexible pipe?
 
gardener & author
Posts: 1731
Location: Ladakh, Indian Himalayas at 10,500 feet, zone 5
287
trees food preservation solar greening the desert
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
If the mass is cob, it can hold itself up pretty well once dry, so I think flexible ducting would work with cob. You'd probably want to stuff something inside the duct to hold it up during the cob process and drying. But if you want to use loose pebbles, then flexible ducting would collapse.
 
gardener
Posts: 2406
Location: latitude 47 N.W. montana zone 6A
347
cat pig rocket stoves
  • Likes 3
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Ted; When you first leave the horizontal transition area , you use one stick of regular black stove pipe,  after that you switch to hvac pipe readily available in 5' sticks at home depot for around $11.00 each.  Use another stick of black pipe when you pop up out of your mass (high abrasion area) the back to hvac up to the roof.  If your chimney is all indoors you will not need insulated pipe until you pass thru your roof.      EDIT )   No flex pipe , the ridges inside resist the flow of hot air.
 
thomas rubino
gardener
Posts: 2406
Location: latitude 47 N.W. montana zone 6A
347
cat pig rocket stoves
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Ted;  Can I ask why you want to use a pebble mass ? Although an accepted build material,  Its not the best medium for holding your heat.  
 
Would you turn that thing down? I'm controlling a mind here! Look ... look at the tiny ad ...
A rocket mass heater heats your home with one tenth the wood of a conventional wood stove
http://woodheat.net
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!