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Galvanized chimney extension?

post #1 of 8
Thread Starter 

I've read extensively on the dangers of using anything galvanized where high temps are present and/or when in contact with the food.
 

1) I just purchased an Oklahoma Joe (triple) from Lowe's. I happen to have some thin galvanized sheet metal I'd like to use as a chimney extension. I rolled it up inside the chimney pipe then pop riveted it top/btm/middle. As the temps to which it will be exposed are not that great and will never be in contact with the food, do you see any problem with this setup?

2) The ID of the chimney is ~2.875". I can find 3" OD tubing in various materials, ducting, pipe, exhaust tubing etc.

3) Obviously, without modding the grate under the chimney, the extension will only go down to grate level. In theory, what is the optimal lower level for the extension? Would there be any benefit from cutting an opening in the grate to lower the level of the extension? I do not foresee the slight loss of grate area as an issue.

 

I have ordered some nomex gasket seal material to seal up the doors, will build a firebox > cooking area baffle/deflector and raise the charcoal grate level. I have a MIG welder and O/A setup as well and am not afraid to use either one. :icon_confused:

David Jones
Boise, Idaho

post #2 of 8
Quote:
Originally Posted by Idaspode View Post
 

I've read extensively on the dangers of using anything galvanized where high temps are present and/or when in contact with the food.
 

1) I just purchased an Oklahoma Joe (triple) from Lowe's. I happen to have some thin galvanized sheet metal I'd like to use as a chimney extension. I rolled it up inside the chimney pipe then pop riveted it top/btm/middle. As the temps to which it will be exposed are not that great and will never be in contact with the food, do you see any problem with this setup?

2) The ID of the chimney is ~2.875". I can find 3" OD tubing in various materials, ducting, pipe, exhaust tubing etc.

3) Obviously, without modding the grate under the chimney, the extension will only go down to grate level. In theory, what is the optimal lower level for the extension? Would there be any benefit from cutting an opening in the grate to lower the level of the extension? I do not foresee the slight loss of grate area as an issue.

 

I have ordered some nomex gasket seal material to seal up the doors, will build a firebox > cooking area baffle/deflector and raise the charcoal grate level. I have a MIG welder and O/A setup as well and am not afraid to use either one. :icon_confused:

David Jones
Boise, Idaho

Buy a piece of aluminum flashing and do what you did.better safe then sorry 

post #3 of 8

You'll be fine with the galvanized but if it would make you feel more comfortable get some aluminium flashing at your local hardware store as said

 

Joe

 

 

http://www.smokingmeatforums.com/newsearch?advanced=1&action=disp&search=zinc&titleonly=0&byuser=boykjo&output=posts&replycompare=gt&numupdates=&sdate=0&newer=1&sort=relevance&order=descending&Search=SEARCH&Search=SEARCH

post #4 of 8
Hold a thermometer over the top of your smoke stack,I assure you it is being exposed to much higher temps than you think. Just because the air flow is going one direction does not mean that other elements can not spread back into the cooking chamber. I wouldn't risk it.
post #5 of 8
Thread Starter 

Thanks for the feedback. I'll go with AL, was just trying to use what I had on hand.

 

David Jones

post #6 of 8
Thread Starter 

Well, I got my galvanized question answered, thank you, but what about:

3) Obviously, without modding the grate under the chimney, the extension will only go down to grate level. In theory, what is the optimal lower level for the extension? Would there be any benefit from cutting an opening in the grate to lower the level of the extension? I do not foresee the slight loss of grate area as an issue.

post #7 of 8
Thread Starter 

BTW, this is the Oklahoma Joe's model I have. I have seen other Longhorn models on this forum but not this one:

http://www.lowes.com/pd_606673-82210-15202029_0__?productId=50329705&Ntt=
 

Lowe's had one on the floor which we liked. Got home and started looking around. My local store did not have any others in stock. I called and the nice fellow on the other end indicated two stores in Boise each had one in stock. I called both, no luck and so much for Lowe's inventory system. The closest store that indicated they had two was 120 miles distant.


I called back to my local store and asked if they would sell the floor model. The young fellow said they couldn't, supposedly for safety reasons. Not long later I called back and got another employee. He said no problem selling me the floor model. Nice, since it saved me from having to assemble it. Of course I went through it and had to tighten some fasteners.

post #8 of 8
I tried the 90° mod and didnt notice any difference in keeping temp. It did come in handy when the rain came.
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