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Running a JB in an enclosed space and..


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Old 10-31-2012, 08:48:37 PM
AndersonMillTexas AndersonMillTexas is offline
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Default Running a JB in an enclosed space and..

Hi everyone,
The weather cleared up and I am about to move my newly aquired 7.5 JB 3CR to the out building.

I want a comfortable place to do my tinkering and possible make this little strucure d its pemenant home.

It is 10' x 12' with a an 8' ceiling and an attick above that. Standard 2x4 construction. Plywood sheathed and cedar shingles but no insulation. Two windows a door and a double door.

I was thinking of poping the exhaust out the side or though the roof. No other special venting.

Do you think it will over heat? will it be over kill to creat ducting or just stick a fan in the window or prehaps leave a door open.

How about a temp gauge on the generator housing or engine block?

Thanks for your ideas.
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Old 10-31-2012, 08:58:57 PM
MBB MBB is offline
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Default Re: Running a JB in an enclosed space and..

I believe Jim Mcintires setup he has a fan running off the AC of the unit to pull the hot air out. If you do that you should have some fresh air vents to suck air in.
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Old 10-31-2012, 08:59:02 PM
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Ray Cardoza Ray Cardoza is offline
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Default Re: Running a JB in an enclosed space and..

just run it through the side not the roof
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Old 10-31-2012, 09:04:02 PM
EnginePat EnginePat is offline
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Default Re: Running a JB in an enclosed space and..

I ran the exhaust thru the wall and down to a trench about 2' deep into a clay thimble and a 20' plastic pipe and back out works great.
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Old 10-31-2012, 09:08:03 PM
AndersonMillTexas AndersonMillTexas is offline
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Default Re: Running a JB in an enclosed space and..

I will try and find jims set up through forum search.
Thank you
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Old 10-31-2012, 09:14:55 PM
AndersonMillTexas AndersonMillTexas is offline
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Default Re: Running a JB in an enclosed space and..

Isnt that quite a bit of back pressure? That is like a 24' run. Why not have it poke out through the roof or wall.

MMM! I could make a plywood with a hole in it and close the window down on the plywood. I wood just pop into place when needed.
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Old 10-31-2012, 09:18:06 PM
AndersonMillTexas AndersonMillTexas is offline
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Default Re: Running a JB in an enclosed space and..

What is a clay thimble?
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Old 10-31-2012, 09:29:31 PM
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Default Re: Running a JB in an enclosed space and..

Nothing too unique about it - I just stuck a fan in the wall. Works well so far...

http://www.smokstak.com/forum/showthread.php?p=662516
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Old 10-31-2012, 09:33:35 PM
Jack Hottel Jack Hottel is offline
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Default Re: Running a JB in an enclosed space and..

Clay thimbles are terra cotta pipes used where smoke pipes connect to brick and mortar chimneys. Not combustible and heat resistant, qualities you need where a possibly red hot exhaust pipe penetrates a wall or roof.
Duct the hot cooling air from the engine and generator outside. Have vents for incoming air, not on the same wall. The generator has plenty of fan to keep itself cool if you don't let the air recirculate.
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Old 10-31-2012, 09:34:53 PM
Ed Sparks Ed Sparks is offline
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Default Re: Running a JB in an enclosed space and..

Go to your local big box store and buy a 3 inch double wall thimble used for pellet stoves. These have enough clearance to keep the combustable away from hot exhaust. Get a 16" long piece of 3" double wall pipe to fit into it. there is a matching galvanized collar to fit over the outside. and seal it from critters.
this will cost you around $25.00 total with tax.

your JB uses a 1 1/2 " exhaust pipe so you can put some copper mesh around it in the pipe to seal the double wall .
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