Duckwork Questions

Duckwork Questions

PostBy: jrn8265 On: Tue Sep 16, 2008 6:42 am

I am a computer Networking guy and have no experience with duckwork so thanks for your patience!

I am thinking about installing my koker myself if I can get the concept.

Please see the attached PDF diagram of how I plan on tying my koker unit into my existing oil system.

Questions that I have are below so far.

I plan on having only one appliance working at one time, never both.

1. First, Do I need to have any "dampers" or "swinging doors" in the duckwork at all the "A" points on the diagram. If not how do I keep the air flow from backing or flowing into the other appliance when one is on and the other is off?

2. At the "B" points on the diagram do I need anything there other than the baro dampers to prevent flow backing up?

3. Is my diagram a solution?

Please point out any problems, concerns suggestions for improvment. Or if I am totally off base.

Thank you!
(290.95 KiB) Downloaded 55 times
Select:BBcode: [nepafile=6340]duckwork.pdf[/nepafile]
Stove/Furnace Make: Keystoker Koker
Stove/Furnace Model: Koker 160

Re: Duckwork Questions

PostBy: Blackdiamonddoug On: Tue Sep 16, 2008 7:17 am

Net work guy
Two appliances require two baro, you have to check local code to make sure its leagal installation.
My guess is you state your only going to run one at a time to get around this?

Air will take the path of least restance.
Your drawing : If your oil furance blower is off and the coal blower is on the air will flow through the coal appliance.
often the coal appliance is put in line before the oil boiler to heat the air and take advantage of the large blower in the oil appliance.This can be done with a few switches so the If the oil appliance call for heat it can ramp up the coal temp.
I hope this is helpful.
Your on track BDD
Stove/Furnace Make: axemen 260 rebuilt by Matt
Stove/Furnace Model: stoker AA 260

Re: Duckwork Questions

PostBy: jrn8265 On: Tue Sep 16, 2008 7:31 am

Yes, one appliance/blower at a time will run only.

How about any dampers needed?

Is the basic duckwork design ok?

Since only one appliance will be running at one time only the blower for that one appliance will be running. The koker has a 1500 cfm blower which I think should be fine to circulate in a 2000 sf house.

Can anyone provide exact details, confirmations?

I plan on not using both blowers at the same time as it may be overkill for my application and too complex for me to deal with.
Stove/Furnace Make: Keystoker Koker
Stove/Furnace Model: Koker 160

Re: Duckwork Questions

PostBy: BIG BEAM On: Tue Sep 16, 2008 5:01 pm

I think it's one baro per chimney.If they were both oil it would be 1 baro.
Stove/Furnace Make: USS Hot blast
Stove/Furnace Model: 1557M

Re: Duckwork Questions

PostBy: DavidL On: Tue Sep 16, 2008 5:59 pm

Net work guy,

I just finished installing the duct work for my coal/wood hot air furnace. I am only using one balanced back draft damper above my oil furnace where my coal furnace ties into. If the coal furnace is running, it will close of the hot air duct from my oil furnace and visa versa. If both are running the damper will hover in the middle. I am following code and building a chimney.

Finished Duct Work

Programmer guy
Stove/Furnace Make: Energy King
Stove/Furnace Model: 480EK

Re: Duckwork Questions

PostBy: Lumberjack On: Tue Sep 16, 2008 11:58 pm

If your installing in parallel then each furnace needs a baro damper on the flue and a back draft damper near the hot air outlet to prevent air from looping from one furnace to the other.
Most states require separate chimneys as well.