520 flue size...

520 flue size...

PostBy: kzad On: Thu May 22, 2008 9:02 am

I finally saw a 520 in action yesterday, and I noticed it has an 8" flue outlet...can that be reduced to 7" or would I have to blast out my chimney opening to use one?
kzad
 
Stove/Furnace Make: Harman Mk III

Re: 520 flue size...

PostBy: stoker-man On: Thu May 22, 2008 11:17 am

I can't recommend anything but what efm calls for....8" chimney.

I know for a fact that many use smaller chimneys because they have good draft. It is usually permissible to have a chimney 1 inch less depending upon the firing rate, but for me, it's the official "line".
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: 520 flue size...

PostBy: kzad On: Thu May 22, 2008 12:29 pm

I believe my chimney tile is 8x8, but the existing thimble is for a 7" smoke pipe for my oil boiler...it's the smoke pipe I would have to reduce...I imagine I could chop it out but I wouldn't want to if it wasn't necessary...
kzad
 
Stove/Furnace Make: Harman Mk III

Re: 520 flue size...

PostBy: coal berner On: Thu May 22, 2008 3:40 pm

1 " will not make a differents get you self a 7 to a 8 reducer for the thimble you will be fine use 8" to the stoker
coal berner
 
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520

Re: 520 flue size...

PostBy: e.alleg On: Fri May 23, 2008 9:18 am

If you plan on running the boiler full steam : 10 teeth, full feed then I'd go 8", In my opinion even a 6" pipe would be fine if only running the boiler at the average 4 teeth.
e.alleg
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: 520 flue size...

PostBy: Scottscoaled On: Fri May 23, 2008 10:03 pm

I run 6" and can't wait to get a bigger chimney. Seems I get a wiff everytime the stoker starts. Sort of like it :) Scott
Scottscoaled
 
Stoker Coal Boiler: EFM 520x4, 350, 700. Van Wert 400 x 2, 800, 1200.
Coal Size/Type: Lots of buck