chimney height

chimney height

PostBy: wilder11354 On: Mon Jan 02, 2012 11:01 pm

when figuring the"height" does that mean only the vertical height of chimney , or does it include the total length of chimney? From back of boiler outlet , horizontal runs and vertical height?

Reason i ask, my vertical height from metalbestos clean out T is 6' Overall. Total length of flue from back of boiler is 12'. would the actual vertical height need to be a minimum of 16' above cleanout T?
wilder11354
 
Hand Fed Coal Boiler: Harman SF260
Coal Size/Type: nut or pea, anthracite
Other Heating: crown oil boiler, backup.if needed

Re: chimney height

PostBy: CapeCoaler On: Mon Jan 02, 2012 11:05 pm

Is the cap of the metalbestos higher than the highest peak of the house...
If so you should be good...
My metalbestos run is short also but ends 4' higher than the peak...
Drafts very well...
CapeCoaler
 
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove

Re: chimney height

PostBy: coaledsweat On: Mon Jan 02, 2012 11:15 pm

wilder11354 wrote:when figuring the"height" does that mean only the vertical height of chimney , or does it include the total length of chimney? From back of boiler outlet , horizontal runs and vertical height?

It is rather informal. Some people measure from the ground to the top of the chimney but really should be the height from the appliance's breach to the top of the chimney. The horizontal stuff doesn't count, only the vertical distance.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea


Re: chimney height

PostBy: wilder11354 On: Mon Jan 02, 2012 11:21 pm

not higher than peak of house, have a 10' Deep X 14'Wide deck, coal boilers in, with roof over it. Chimney comes out end wall about 9' from the house main wall, and top of coal boiler chimney is 5 feet above deck roof. deck roof is a 12/2 pitch. coal chimney is 9 feet from main house structure. Guess a picture would work best. Tomorrow for that.
wilder11354
 
Hand Fed Coal Boiler: Harman SF260
Coal Size/Type: nut or pea, anthracite
Other Heating: crown oil boiler, backup.if needed

Re: chimney height

PostBy: wilder11354 On: Mon Jan 02, 2012 11:24 pm

coaledsweat wrote:
wilder11354 wrote:when figuring the"height" does that mean only the vertical height of chimney , or does it include the total length of chimney? From back of boiler outlet , horizontal runs and vertical height?

It is rather informal. Some people measure from the ground to the top of the chimney but really should be the height from the appliance's breach to the top of the chimney. The horizontal stuff doesn't count, only the vertical distance.


So i should add another 4 foot section of chimney. probably would help improve draft some.
wilder11354
 
Hand Fed Coal Boiler: Harman SF260
Coal Size/Type: nut or pea, anthracite
Other Heating: crown oil boiler, backup.if needed

Re: chimney height

PostBy: coaledsweat On: Mon Jan 02, 2012 11:34 pm

2' above anything within 10' IIRC.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: chimney height

PostBy: Berlin On: Mon Jan 02, 2012 11:59 pm

coaledsweat wrote:2' above anything within 10' IIRC.


That's right but I would add that the above requirement is an absolute minimum requirement to achieve at least a mediocre level of performance. I don't like to think of it as a recommendation, a recommendation would be go as high as you can (within reason) while exceeding both the rule and the highest portion of the home or structure that the stack will be located in by at least two feet. Most problems with draft are due to the stack effect of the home out-competing the draw of the chimney - especially for chimneys connected to basement appliances.
Berlin
 
Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
Coal Size/Type: Ohio BITUMINOUS pea stoker coal

Re: chimney height

PostBy: titleist1 On: Tue Jan 03, 2012 10:24 am

Do you have a manometer connected to see what your draft reading is? That would tell you if the additional chimney height is doing you any good or not (or even necessary).
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: chimney height

PostBy: Rob R. On: Tue Jan 03, 2012 2:30 pm

wilder11354 wrote: So i should add another 4 foot section of chimney. probably would help improve draft some.


If the current chimney is below the roofline of the main house, then yes.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice/buck
Other Heating: Dad's 1953 EFM Highboy