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Firebox to CC opening question

 
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Phils67



Joined: 14 Mar 2017
Posts: 19

PostPosted: Fri Mar 24 17 9:10 pm    Post subject: Firebox to CC opening question Reply with quote

OK,

I apologize in advance if this gets a little bit long trying to explain....

Offset reverse flow smoker.

The FB will be partially cut into the 24" x 48" pipe ( CC ) to be welded together.

I have a 4" notch planned for the overlap.

My question revolves around the opening from the firebox to the cooking chamber and the opening that I will have.

The opening FB to CC is 65 square inches, but with a 4" overlap that opens up to 65 cubed inches, right???

So, given my math, can I reduce the opening in the FB to CC by 75%????

Around 16.25" would be the 75% reduction....

The firebox is currently 20" wide by 27.25" high by 21.5" deep.

The fire grate is 5" up from the bottom of the box, for ash room.

Phil.
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Phils67



Joined: 14 Mar 2017
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PostPosted: Fri Mar 24 17 9:14 pm    Post subject: Reply with quote

There is a 1" grease dam in the bottom of the cooking chamber with that 65" opening.

It tapers to the round sides of the 24" cooking chamber pipe.


Phil.
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Phils67



Joined: 14 Mar 2017
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PostPosted: Fri Mar 24 17 9:19 pm    Post subject: Reply with quote

According to Felldon I need a 7234.56 fire box.


I have a 11717.5 firebox putting me at 162%.........


If I could reduce the opening in my fire box I could reduce the overall size of the fire box.

Phil.
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Phils67



Joined: 14 Mar 2017
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PostPosted: Tue Mar 28 17 11:31 pm    Post subject: Reply with quote

This cooker also has a warming box directly on top of the fire box.

It will have 2 openings in it from the firebox, as well as 1 from the cooking chamber, hence the extra size of the fire box.

Phil.
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biker.chef
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Joined: 28 Jun 2010
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PostPosted: Wed Mar 29 17 3:57 am    Post subject: Reply with quote

I don't understand how you went from inches squared to inches cubed.
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Phils67



Joined: 14 Mar 2017
Posts: 19

PostPosted: Wed Mar 29 17 11:10 pm    Post subject: Reply with quote

biker.chef wrote:
I don't understand how you went from inches squared to inches cubed.


It`s quite possible I have this wrong, hence my question.

The FB will not be butted up to the CC pipe but notched in 4" into the CC pipe.

IF...the FB was to be welded flat onto the end of the CC then Sq. In. would be appropriate, since I`m going to set my FB into the CC by 4" does that then move me into Cubic Inches of opening????? 65 x 4 = 260"????????????????

Sounds way off, this is why I`m asking BEFORE I cut!!!!!

Phil.
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biker.chef
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PostPosted: Thu Mar 30 17 2:08 am    Post subject: Reply with quote

I ain't an expert on this but the opening from the firebox to the
cooker is measured in inches squared. Not cubic inches.
Its the size of the opening that air can flow through. Not the volume of space.
For the stack its volume, diameter & length.

Maybe post in the cooker forum. Someone should reply there.
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k.a.m.
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PostPosted: Thu Mar 30 17 6:20 am    Post subject: Reply with quote

You have a square firebox that will have an opening at the top of 65 Sq. in. You cut 4" into the pipe so I am guessing to reduce the overall footprint of the cooker? Either way you still have a 65 Sq. in. opening. There is no Cu. in. involved here unless I am not understanding what your'e asking.
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Jdbl07



Joined: 04 Apr 2017
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PostPosted: Wed Apr 05 17 9:06 pm    Post subject: Firebox size Reply with quote

How do you convert the cubic inches Feldon's gives you to find out how big the box needs to be?
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biker.chef
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PostPosted: Wed Apr 05 17 9:57 pm    Post subject: Reply with quote

Quote:

The firebox is currently 20" wide by 27.25" high by 21.5" deep.


that would be 20 x 27.5 x 21.5 = 11,825 cubic inches
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