Exhaust(ing) question

smooookin · 01-11-2008, 04:49 PM

Today I started working on the XXL UDS my question is how big the exhaust should be.

I found a 4 inch roof vent that would be perfect for what I want. I didn’t buy it today because I am thinking I might need to go bigger.

Thoughts?

Bbq Bubba · 01-11-2008, 04:58 PM

I would think 4" would be suffecient, you gonna have the standard 4 intake hole's but probably larger than normal
Heat rises so the drum act's like a natural chimney as far as air draw goes IMO.

smooookin · 01-11-2008, 05:07 PM

Quote:

Originally Posted by Bbq Bubba

I would think 4" would be suffecient, you gonna have the standard 4 intake hole's but probably larger than normal
Heat rises so the drum act's like a natural chimney as far as air draw goes IMO.

Actually I think I am going to go with 4 or 5 1/2 nipples.

She's gonna be a big one. I took several pictures along the way. Here is one of them.

I will post a thread later as I have to leave town in a couple of hours for the weekend.

Dr_KY · 01-11-2008, 05:19 PM

Why not 3/4 or 1'' nipples?

smooookin · 01-11-2008, 05:22 PM

Quote:

Originally Posted by Dr_KY

Why not 3/4 or 1'' nipples?

I was once traumatized by big nipples.

Actually 1/2 is what I have. (cheap mod)

N8man · 01-11-2008, 05:24 PM

You don't think 4" is gonna be too big, do you? Just saying that there maybe a fire control issue with too big of an exhaust or too much draft...But, you are venturing into unknown territory with that Behemoth DrumPit you're building.
Perhaps there are some intake to exhaust ratios pit builders use to determine
flow volume.

Bbq Bubba · 01-11-2008, 05:24 PM

Look's like a good start, hardest part will be getting them door's to seal tight!!
Ya can't tease us like that and then leave!!!

smooookin · 01-11-2008, 05:31 PM

Quote:

Originally Posted by N8man

You don't think 4" is gonna be too big, do you? Just saying that there maybe a fire control issue with too big of an exhaust or too much draft...But, you are venturing into unknown territory with that Behemoth DrumPit you're building.
Perhaps there are some intake to exhaust ratios pit builders use to determine
flow volume.

I am thinking four inch going by the exstensin I have going right now. Just using the 2 in opening and the 3/4 (?) in the top was not enough. I cut a hole almost 2in in the top, in addition to the 2 in bung onpening, with three caps out today she has run 240-245.

Azinine · 01-11-2008, 05:38 PM

off topic, but how many cooking grates are you planning on having in that sucker?

N8man · 01-11-2008, 05:46 PM

4" exhaust it is. Man, that's gonna a BEAST!!!! Good Luck with your build and I look forward to seeing it smoking some meat!!!!

Meat Burner · 01-11-2008, 05:50 PM

Smooookin, did you get my e-mail?

smooookin · 01-11-2008, 06:19 PM

Quote:

Originally Posted by Azinine

off topic, but how many cooking grates are you planning on having in that sucker?

One in the top for beans corn etc and one at the bottom for a catchers mit!

everything will hang under the top grate.
If needed I can put enough grates in to do approx 30 butts.

RichardF · 01-11-2008, 06:23 PM

Quote:

Originally Posted by smooookin

I was once traumatized by big nipples.

Actually 1/2 is what I have. (cheap mod)

Like these

Dr_KY · 01-11-2008, 07:06 PM

Quote:

Originally Posted by smooookin

I was once traumatized by big nipples.

Actually 1/2 is what I have. (cheap mod)

I know the feeling

With the height being what it is have you considered running the top vent off the side of the highest point of the top drum so you can adjust if need be? * Pull and pok with a broomstick mod*

ipls3355 · 01-11-2008, 07:16 PM

Make sure and document how you get the doors to seal. I am thinking of making one of these.

01-11-2008, 04:49 PM	#1
smooookin is One Chatty Farker Join Date: 03-04-07 Location: KC Mo.	Exhaust(ing) question Today I started working on the XXL UDS my question is how big the exhaust should be. I found a 4 inch roof vent that would be perfect for what I want. I didn’t buy it today because I am thinking I might need to go bigger. Thoughts? __________________ "Foil is a BBQ mans duct tape" my wife.

01-11-2008, 04:58 PM	#2
Bbq Bubba somebody shut me the fark up. Join Date: 05-03-07 Location: New Baltimore, Mi.	I would think 4" would be suffecient, you gonna have the standard 4 intake hole's but probably larger than normal Heat rises so the drum act's like a natural chimney as far as air draw goes IMO. __________________ Owner of Bubba's BBQ & Catering L.L.C. Beer Snob I cook the #bestbrisketnorthoftexas. Get over it. #detroitporkmafia BBQ Person of the Year 2013

01-11-2008, 05:19 PM	#4
Dr_KY Quintessential Chatty Farker Join Date: 12-15-07 Location: England	Why not 3/4 or 1'' nipples? __________________ www.drsweetsmoke.com Slappin that bass like some delerious funky preist!!! UDS, Half Pint (Mini UDS), Weber, ProQ 20, Kegrilla 250 gallon cooker- 'The Meat Beast!!' British BBQ Championships Grand Champion 2008 ~~~~ British BBQ Society - Southern Championship Grand Champions 2009

01-11-2008, 05:24 PM	#6
N8man Babbling Farker Join Date: 05-09-07 Location: God's Country Ossipee-Osceola NC	You don't think 4" is gonna be too big, do you? Just saying that there maybe a fire control issue with too big of an exhaust or too much draft...But, you are venturing into unknown territory with that Behemoth DrumPit you're building. Perhaps there are some intake to exhaust ratios pit builders use to determine flow volume. __________________ N8man Average Joe Backyard Enthusiast How I Fire Up That Ugly DrumPit Smoker!!!!

01-11-2008, 05:24 PM	#7
Bbq Bubba somebody shut me the fark up. Join Date: 05-03-07 Location: New Baltimore, Mi.	Look's like a good start, hardest part will be getting them door's to seal tight!! Ya can't tease us like that and then leave!!! __________________ Owner of Bubba's BBQ & Catering L.L.C. Beer Snob I cook the #bestbrisketnorthoftexas. Get over it. #detroitporkmafia BBQ Person of the Year 2013

01-11-2008, 05:38 PM	#9
Azinine Take a breath! Join Date: 02-16-07 Location: Atlanta, GA	off topic, but how many cooking grates are you planning on having in that sucker? __________________ Jared "Yeah, but bacon tastes gooood. Pork chops taste gooood" -Pulp Fiction Weber Smokey Mountain Weber 22.5" One Touch Silver Charbroil Silver Smoker w/ mods (never used anymore)

01-11-2008, 05:46 PM	#10
N8man Babbling Farker Join Date: 05-09-07 Location: God's Country Ossipee-Osceola NC	4" exhaust it is. Man, that's gonna a BEAST!!!! Good Luck with your build and I look forward to seeing it smoking some meat!!!! __________________ N8man Average Joe Backyard Enthusiast How I Fire Up That Ugly DrumPit Smoker!!!!

01-11-2008, 05:50 PM	#11
Meat Burner Quintessential Chatty Farker Join Date: 02-22-07 Location: Springfield, MO	Smooookin, did you get my e-mail? __________________ my avatar swiped fatties from the plate....look how sorry he is. ________ Meat. NB Bandera with mods Weber 22 .5" x 2, 26.75" x 1 UDS x 3 KCBS CBJ Created "The Great Spam Revelation of 2011." www.bbq-brethren.com/forum/showthread.php?t=111155

01-11-2008, 07:16 PM	#15
ipls3355 is one Smokin' Farker Join Date: 04-27-07 Location: Mattoon, IL	Make sure and document how you get the doors to seal. I am thinking of making one of these. __________________ Chris Crankin out Q on my ECB since 2005 UDS born September, 2007 22" Weber Kettle 18" Weber Kettle

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