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Old 02-22-2021, 10:59 PM   #21
Mini-Skoolie
 
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Join Date: Dec 2016
Location: Bellingham , Washington
Posts: 22
Year: 1958
Coachwork: Kenworth Pacific
Chassis: CT 73 E
Engine: 350 Cummins. 855cu in
Rated Cap: 73
Quote:
Originally Posted by djdalfaro View Post
Have you had any issues with law enforcement commenting on your use of off-road diesel? It appears that your chimney doesn't reach the recommended length (I think 6ft or so), but you've confirmed you've had no draft issues. Can you give a rough estimate on the length. I'm trying to decide whether I should plan on an extended detachable chimney above the roof, but yours is rather short (which is much more desirable).
Chimney is 4 feet from top of stove to top of chimney but I do run the fan that feeds air to the fire box. I replaced the original fan with a fan from a computer and can hardly hear it running. The off-road diesel is used in the dedicated 40gal stove tank that can be transferred to the main tank if needed, I wouldn't want to get nailed for running it the engine, big fine for that I guess. My chimney is 4" diameter and I think the new ones or 5".

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Old 02-23-2021, 05:34 PM   #22
Bus Geek
 
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Join Date: Sep 2017
Location: Swansboro,NC
Posts: 3,123
Year: 86
Coachwork: Thomas
Chassis: Ford B700
Engine: 8.2
Rated Cap: 60 bodies
the shorter the length and the least amount of turns for fuel fired flue pipe is key.
code for a fuel fired appliance flue pipe only says 2 feet above average snow load for your area.
and most manufacturers instructions allow longer runs and extra elbows if you increase the size of the flue pipe.
as far as the flashing or roof boot DEKTITE make a rubber silicone roof boot that are made for hot pipe penetrations.
i call them hot boots but they are the red ones on there website.
i havent looked at your specific equipment but i build and work on fuel oil natural gas and propane fired boilers for a living.
i have ran schedule 80 pvc off of fuel oil fired boilers and CPVC but the temperature limit switch is the key.
dont waste your time
double wall b-vent stainless steel with the termination cap.
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Old 02-23-2021, 08:14 PM   #23
Bus Nut
 
Join Date: Apr 2018
Location: League City, TX
Posts: 321
Year: 1994
Coachwork: Thomas
Chassis: International 3800
Engine: DT408 6.7L L6
Rated Cap: 14
Quote:
Originally Posted by Jolly Roger bus 223 View Post
the shorter the length and the least amount of turns for fuel fired flue pipe is key.
code for a fuel fired appliance flue pipe only says 2 feet above average snow load for your area.
and most manufacturers instructions allow longer runs and extra elbows if you increase the size of the flue pipe.
as far as the flashing or roof boot DEKTITE make a rubber silicone roof boot that are made for hot pipe penetrations.
i call them hot boots but they are the red ones on there website.
i havent looked at your specific equipment but i build and work on fuel oil natural gas and propane fired boilers for a living.
i have ran schedule 80 pvc off of fuel oil fired boilers and CPVC but the temperature limit switch is the key.
dont waste your time
double wall b-vent stainless steel with the termination cap.

Thank you! Your post raise more questions, which is always a good thing.

1. Can you give me a quick technical explanation of why shorter is better with fuel?
2. Have you seen the DEKTITE on buses? Is that still what you'd recommend?
3. PVC and CPVC? I'm assuming you are talking about the water connections. Which would you recommend as the best?
4. Dickinson says double wall will increase draft, but recommends single-wall to release more heat into the cabin. What is reason you suggest suggest anything other than double wall b-vent to be a waste? In my research I was unable to find 4" SS oval -> double wall b-vent adapter, or even a barometric dampener (which Dickinson recommends). Do you have any suggestions on solutions? This will be my first chimney (?flue?, idk...)

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Old 02-24-2021, 12:46 AM   #24
Bus Nut
 
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Join Date: Jul 2017
Location: Rapid City, SD
Posts: 993
Year: 2001
Coachwork: Blue Bird
Chassis: CS RE
Engine: ISC 8.3 L 260 hp
Rated Cap: 36
I was just reading through dickinson install manual for their heaters. According to them you bend the single wall round stove pipe over the oval. I would check the install manual for your model. Other installs I've seen they use single wall on the interior and switch to double outside. They recommend certain min and max length of stove pipe depending on model and pipe diameter.

Ted
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