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Firebox intake Question

fishing1

Newbie
18
10
Joined Jan 20, 2014
I will be adding a new fresh air intake to my rf. Should this be under or over the grate where the fire will be ????      Thanks Fishing1
 

crazyq

Meat Mopper
264
19
Joined Feb 7, 2014
Below grate is always best. I try to split it half and half but if ur not getting fresh air under the fire it wont burn or draft right. You'll have cold starts too.
 

gary s

SMF Hall of Fame Pitmaster
OTBS Member
25,964
4,437
Joined Jan 6, 2011
You need air under your fire grate, mine is set up where it pulls air under the grate and some on top. I am going to add an additional vent higher up even with the FB to CC opening as per Dave O's recommendation to help further the efficiency .

Gary
 

crazyq

Meat Mopper
264
19
Joined Feb 7, 2014
I thot about doing mine like that on top to give it a "push" towards the FB-CC opening Gary but havnt decided yet.
 

sqwib

Smoking Guru
OTBS Member
5,967
1,021
Joined Sep 25, 2007
Primary intake below the fire grate but high enough not to be affected by ash buildup.

You can put in a secondary above the fire that you can choke down to give better control, Others have done this and reported good results, I don't see a need for it but to be fair I have never tried it as my pit functions near perfect for my style of cooking.
 

ribwizzard

Master of the Pit
2,183
84
Joined May 10, 2012
I just want more control of where I want the air to hit the fire. Dividing the vents into more levels with smaller holes was the next logical step.
 

crazyq

Meat Mopper
264
19
Joined Feb 7, 2014
Makes sense. Ive never seen one done with a vent above the grate line that far. But hey, if it works, it works.
 

ribwizzard

Master of the Pit
2,183
84
Joined May 10, 2012
I actually built a couple vertices smokers years ago where I plumbed fresh air to the top of the flames with 1.25 schedule 80, The pipe pulled air from under the firebox and used the heat of the firebox to suck the oxy rich air up the pipe then exited at the top of the flames. It worked real good, but pipe didn't hold up in the harsh environment of the firebox but a few years. SO I just started raising the intakes higher to get fresh air to the flames. Took a couple years to convince people that it worked, but it's just now starting to catch on
 

sqwib

Smoking Guru
OTBS Member
5,967
1,021
Joined Sep 25, 2007
I actually built a couple vertices smokers years ago where I plumbed fresh air to the top of the flames with 1.25 schedule 80, The pipe pulled air from under the firebox and used the heat of the firebox to suck the oxy rich air up the pipe then exited at the top of the flames. It worked real good, but pipe didn't hold up in the harsh environment of the firebox but a few years. SO I just started raising the intakes higher to get fresh air to the flames. Took a couple years to convince people that it worked, but it's just now starting to catch on
I wish I had the [email protected] to try it and I would if the performance of my pit was lacking.

Maybe next build!
 
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ribwizzard

Master of the Pit
2,183
84
Joined May 10, 2012
id say, if your pit is doing fine and you have already learned her ( by the looks of your cooking pics, you have) . leave it be.
 

maple sticks

Smoking Fanatic
316
23
Joined Jan 19, 2013
Feed my fire from the top only once tank is warm. Found heat is even across tank and from top to bottom that way. Its not a reverse flow, not sure what you would call it. Guess fire in a tank as my cooker has a basket inside both ends of the cook chamber.  Had a real problem with even temps till I added stack and started adding air at top only. Does me a good job now.
 

redwood carlos

Smoking Fanatic
366
21
Joined Mar 12, 2013
I actually built a couple vertices smokers years ago where I plumbed fresh air to the top of the flames with 1.25 schedule 80, The pipe pulled air from under the firebox and used the heat of the firebox to suck the oxy rich air up the pipe then exited at the top of the flames. It worked real good, but pipe didn't hold up in the harsh environment of the firebox but a few years. SO I just started raising the intakes higher to get fresh air to the flames. Took a couple years to convince people that it worked, but it's just now starting to catch on
Do you mean something like this?


I am trying to finish my design for a build I want to finish in time for spring. Would love to try and implement this, with maybe a replaceable tube.
 

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