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Fire Box questions

 
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tico



Joined: 19 Sep 2013
Posts: 7

PostPosted: Fri Sep 20 13 1:42 am    Post subject: Fire Box questions Reply with quote

I am building my first reverse flow smoker and would like to try and minimize my mistakes and wasting of material.

The cook chamber will be a 20" pipe 72" long 1/4 wall.
According to the calculators and excel spreadsheets I need a 20" square firebox.

Now here is my concern I will be adding and ash drawer and a small propane burner to the fire box to assist with log lighting, and stable heat if needed for a long burn.
Do I need to increase the box size to compensate for the added space being taken away from the chamber.
I can easily make the box 24x20x20.

Are there any drawbacks to having a larger than recommended fire box.
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garyeng
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PostPosted: Fri Sep 20 13 4:03 am    Post subject: Reply with quote

There are no drawbacks to making it larger but only to making it too small.

Gary
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dawg
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PostPosted: Fri Sep 20 13 6:58 am    Post subject: Reply with quote

make your firebox bigger than it needs to be, a firebox that is to small is a pain all around
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k.a.m.
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PostPosted: Fri Sep 20 13 7:15 am    Post subject: Reply with quote

Welcome to the ring tico. looking forward to seeing some pics of your cooks and following your cooker project. Smile
I prefer my fireboxes to be a little over sized but not grossly over sized.
Your current 20" square firebox is slightly larger than needed and will work fine. There is no need in increasing it for the reasons you asked.
I would refrain from using the propane assist as a heat source for cooking unless you plan on having safety devices in place to shut off the gas if the flame goes out.
I would hate to read that you or someone around the cooker met with the same fate as a recent cooker owner that lost his life using propane in a wood burner.
I hope this helps. Very Happy
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tico



Joined: 19 Sep 2013
Posts: 7

PostPosted: Fri Sep 20 13 8:49 am    Post subject: Reply with quote

Thanks for the concern on the propane assist. I will not use it to cook. I really want to use it as a log/charcoal starter.

I was thinking of adding a furnace blower / ignitor at a later date if I want to use the propane as a cooking heat source.

This will be a long term slow build, as I gather parts and materials.

I will gladly post photos of my progression.
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Pappy
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PostPosted: Fri Sep 20 13 9:32 am    Post subject: Reply with quote

Just use a weed burner to light the firebox.
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tico



Joined: 19 Sep 2013
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PostPosted: Sat Sep 21 13 9:48 am    Post subject: Reply with quote

A weed burner will work, but it is so much cooler to have one built in.
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SoEzzy
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PostPosted: Sat Sep 21 13 9:53 am    Post subject: Reply with quote

It's also way more dangerous to have one built in...even for people who have been running pits for a number of years.

You might find this interesting.

http://www.thesmokering.com/forum/viewtopic.php?t=51291
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garyeng
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PostPosted: Sun Sep 22 13 8:24 am    Post subject: Reply with quote

I do not use a weed burner or a propane log lighter. I just fill-up a chimney full of charcoal and light that off. I then pour that in the firebox when it gets going good and add logs on top of that. Works like a charm and never any problems.

Gary
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TrailerBuilder
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Joined: 08 Feb 2010
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PostPosted: Sun Sep 22 13 8:40 pm    Post subject: Reply with quote

tico wrote:
Quote:
A weed burner will work, but it is so much cooler to have one built in.


Obviously being cool is much more important than common sense Rolling Eyes One lapse of reason and the worst can happen.
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tico



Joined: 19 Sep 2013
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PostPosted: Wed Sep 25 13 2:36 am    Post subject: Reply with quote

Ok. I will not install a log lighter !!!
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Painless
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PostPosted: Wed Sep 25 13 5:49 am    Post subject: Reply with quote

Tico, sorry to hijack your thread but I'm also designing my firebox and just wanted to ask a few more questions that seem to fit with what is discussed here.

Is it better to have vents on the door or along the sides? or it doesn't matter as long as they are low and have adequate ventilation to feed the fire? (I am using the calculator).
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SoEzzy
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PostPosted: Wed Sep 25 13 6:11 am    Post subject: Reply with quote

Painless, it is better to be able to adjust your intakes, to also take account of where the wind is blowing from than to have to move the cooker, if the wind is blowing from the wrong side.

If you have openings on the door and on both sides, and any one could regulate the intake for the whole fire, you have maximized your ability to take care of the needed intake even on a windy day!

See disclaimer below!
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Painless
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PostPosted: Wed Sep 25 13 7:46 am    Post subject: Reply with quote

That's interesting. Something I have not considered. Thanks.

My current line of thinking is to use to 6" pipes set into the door (this is essayist as the door will be a manageable size to fiddle with. If i find wind to be a problem I'll just install some shields.

Again thanks.
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tico



Joined: 19 Sep 2013
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PostPosted: Wed Sep 25 13 8:33 am    Post subject: Reply with quote

My plan is to install dampeners on the front and back of the firebox.
I will also be able to use my ash drawer on the side if all else fails.
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Painless
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PostPosted: Wed Sep 25 13 10:30 am    Post subject: Reply with quote

I'm thinking i like the look of this style damper.

http://i416.photobucket.com/albums/pp250/chinojosa_02/mini-SmokerPit3.jpg

As I'm getting my firebox laser cut it would be no trouble to use this style. What kind are you planning?
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tico



Joined: 19 Sep 2013
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PostPosted: Fri Sep 27 13 8:01 pm    Post subject: Reply with quote

Just a simple rectangular sliding door.
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SoEzzy
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PostPosted: Fri Sep 27 13 9:40 pm    Post subject: Reply with quote

Painless please read PMPNLT650pxOTLS!
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Painless
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PostPosted: Sat Sep 28 13 2:57 am    Post subject: Reply with quote

SoEzzy wrote:
Painless please read PMPNLT650pxOTLS!


Apologies sir. I forgot to check.
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