Exhaust stack redo?

[phathead69]

Here is my smoker I built. Works pretty well I can maintain temps and produce pretty good q with it. Stack about 12 tall 3
Diameter. Draws great with no issues.

Here's my problem. The overhang was added to all four side couple months ago after the smoker was in place and now I'm blacking it up. I don't want to move the smoker back since I have some protection from the rain.


Here's my solution if you guys think it will still draw fine. Roughly 3 up, 19 over @ 45°, 14 to 16 up again all 4 inch diameter pipe. Let me know your opinions. This will clear my over hang putting the exhaust roughly 2 inches above it. I know its adding 24 or so inches of length but adding another inch in diameter.

 

[phathead69]

Anybody with some input?

 

[oldsmokerdude]

Depends on the size of your fire box and a couple more less impactful variables. I would look at one of the on-line calculators to get a recommended and max and min length.
http://www.feldoncentral.com/bbqcalculator.html

 

[JckDanls 07]

Something like that would probably have to be a trial and error... make a temporary one out of the 3"and/or 4" dryer duct... and see what happens ...

 

[Berettaclayshooter]

you will end up with a total stack length of 45" measuring from centerline. I would suggest if you do make an offset, use tube fittings rather than miters, it will flow much better. Here is a link to what i'm talking about https://www.jmesales.com/dixon-sani...shed-304ss-45-long-weld-elbows-with-tangents/

 

[Lonzinomaker]

I would put a 6 in pipe just above the top of the stack (only need an inch or less gap above) and go through the roof. There should be enough heat to make it draw through the 6 in. Put a cap on the 6 in to block rain. Positioning may require trial and error.
Every bend you put in the stack increases restriction by 15-20% if I remember my wood stove installations.