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Old 01-29-2017, 04:46 PM   #1
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chimney blow back help

i have had a wood stove for a few months now. every once in awhile i get high winds that create blowback. can anyone help me?

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Old 01-29-2017, 04:55 PM   #2
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How are you set up outside? )
Haven't messed with chimneys in years, (But I've modified BBQ smokers) but you've got to fine tune the draft to get a clean efficient burn... And to get that draft, you've got to have length. Most everything I've seen or heard about requires at least 3' above the highest point of roof.

A quick google image search for chimney backflow preventers resulted in some pretty good designs.

Other than that, I got nothin'
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Old 01-29-2017, 05:18 PM   #3
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Old 01-29-2017, 05:20 PM   #4
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its a temporary setup, as its winter and cutting hole in my skoolie may cause issues i cannot repair in 1 days time.
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Old 01-29-2017, 06:35 PM   #5
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I've seen some people that do a 90 on the out side. So the exhaust would be pointing up and not sideways.
Just an observation. I imagine, if there is wind, it is easier for it to travel sideways than downwards.
Noob here, fyi.

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Old 01-29-2017, 06:52 PM   #6
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That set up will not draft properly.... The heated air needs to clear the top of the stack.
I understand what you mean about not cutting into the roof yet, and I'm pretty sure a 90 bend upward and a 3' section of pipe, then the cap will help immensely.

If you're noticing air coming in a blowing your ashes when you open the door... You can guarantee that air is blowing in while the door is closed... Thereby pressurizing the firebox!
Not a good thing!
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Old 01-29-2017, 06:55 PM   #7
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I would suggest a 90 degree fitting just outside the window (or a T, and close off the bottom). Run the chimney up and above the bus by a bit.

Um... is that for-reals chimney tube above the triple-wall? If it's dryer vent tubing I foresee trouble. You might try a couple of 45 degree elbows: one above the stove, run the straight connecting pipe out your collar, then another 45 to take it to vertical.
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Old 01-29-2017, 07:41 PM   #8
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Originally Posted by Dapplecreek View Post
I would suggest a 90 degree fitting just outside the window (or a T, and close off the bottom). Run the chimney up and above the bus by a bit.

Um... is that for-reals chimney tube above the triple-wall? If it's dryer vent tubing I foresee trouble. You might try a couple of 45 degree elbows: one above the stove, run the straight connecting pipe out your collar, then another 45 to take it to vertical.
i thought the same thing about the exterior 90 or at least 45. i was told to try venting straight out. i dont think the weight be supported for an extra 3 feet. or more than a 12 inches.

nope, that is the fake stuff as the 90 will not fit. it is to tall by a few inches. this is temporarily in until my skoolies interior is completed and im certain where i want to place the wood stove. i cant cut during the winter.
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Old 01-29-2017, 07:45 PM   #9
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Originally Posted by milkmania View Post
That set up will not draft properly.... The heated air needs to clear the top of the stack.
I understand what you mean about not cutting into the roof yet, and I'm pretty sure a 90 bend upward and a 3' section of pipe, then the cap will help immensely.

If you're noticing air coming in a blowing your ashes when you open the door... You can guarantee that air is blowing in while the door is closed... Thereby pressurizing the firebox!
Not a good thing!
crap, i doubt the collar can support that much weight though. how much would a 45 and cap help do you think?

no, it isnt blowing my ashed when i open the door or hadnt noticed if it had. however with this new setup i did notice that the area was extremely cold compared to the rest of the skoolie. is that an indication of pressurizing the box?
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Old 01-29-2017, 07:53 PM   #10
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not sure how much advice i can give you here since mine is straight up. I've got 5 feet of piping above my stove and my draft works perfect.
You should have a dampener in the pipe if there isnt on on top of the stove, that will stop some drafts as well as control the amount of air the fire gets. When i open the chute on the front of my woodstove i can actually hear the fire roar up, as well as when i turn the dampener to open more, so with both of those i control my fire pretty damn good.

I hardly know anything about this stuff, and cant tell what type of cap you have but there are different types of caps for different types of fuel stoves such as propane, pellet, wood. Use the correct type of cap for the correct flow for the fuel you use if you haven't already.

my best guess is the combination of short length and going straight out and stopping rather than out than up with an elbow.
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