chester5731 Posted March 14, 2013 Share Posted March 14, 2013 I am going to be installing a rivit forge in my little 12x16 shed. I am going to use a 15 gal barrel for the hood and 8 inch pipe since that is the largest I can find. The pipe will go up about 4 feet then over about 4 feet and then up over the roof. My question is will it make much difference if I use two 90 degree elbows or should I use two 45 degree elbows? I want to get the best draft possible but 90's would be easier for me to work with. Thanks for any help and suggestions. Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted March 14, 2013 Share Posted March 14, 2013 yes. a pair of 45 has less resistance than one 90. also if you cant get 12 inch pipe, double up 6 sections of the 6 and make it a12. the 8 is too small. I hate to see you spend the money and time and not have it work, due to not reading beforehand. Quote Link to comment Share on other sites More sharing options...
1forgeur Posted March 15, 2013 Share Posted March 15, 2013 8 inch is not so good. Been there done that. Quote Link to comment Share on other sites More sharing options...
Perry Thomasson Posted March 15, 2013 Share Posted March 15, 2013 Here is a good read at this link. http://www.beautifuliron.com/chimneys.htm I have purchased some 12 inch 26 gauge spiral duct from a HVAC company that I will be installing soon. I will post some photos when it is complete. Perry Quote Link to comment Share on other sites More sharing options...
chester5731 Posted March 15, 2013 Author Share Posted March 15, 2013 Thanks for the suggestions. I am looking forward to seeng photos. Any ideas for a 12" flashing thru a metal roof? Quote Link to comment Share on other sites More sharing options...
Woodsydad Posted March 16, 2013 Share Posted March 16, 2013 Two 45 degree angles is a lot more efficient. In many places it is illegal to use 90 degree angles for fireplaces because of the redistance. Quote Link to comment Share on other sites More sharing options...
Perry Thomasson Posted March 16, 2013 Share Posted March 16, 2013 http://www.pipebootexpress.com/ Put this in your browser. I have seen phtos of this application doing a search. I have ordered one and will be installing once I get the duct through the metal roof. The silicone boot is rated for 437*F continuous. I have checked temps on other installs and this should be fine. Perry Quote Link to comment Share on other sites More sharing options...
chester5731 Posted March 16, 2013 Author Share Posted March 16, 2013 http://www.pipebootexpress.com/ Put this in your browser. I have seen phtos of this application doing a search. I have ordered one and will be installing once I get the duct through the metal roof. The silicone boot is rated for 437*F continuous. I have checked temps on other installs and this should be fine. Perry Thanks for the link. I think that is what I am going to go with. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.