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Q-talk *ON TOPIC ONLY* QUALITY ON TOPIC discussion of Backyard BBQ, grilling, Equipment and just outdoor cookin' in general, hints, tips, tricks & techniques, success, failures... but stay on topic. And watch for that hijacking.


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Unread 02-06-2013, 11:05 AM   #1
Freddy j
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Default UDS intake pipe diameter

what size pipe & valve is everyone using on UDS intake? also, does one intake provide enough air to get the temp up to 325-350F?
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Unread 02-06-2013, 11:12 AM   #2
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Mine are 1", I believe most people use 3/4". One intake is probably not enough - I have 3, and usually shut one down once the pit is going and have one wide open and the other I adjust with a ball valve. I normally cook at higher heat - usually around 300. It's probably worth mentioning that my exhaust is 2" pipe with an elbow (always open), since exhaust figures in to air flow & pit temps.
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Unread 02-06-2013, 11:13 AM   #3
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3/4" pipe and valve. You will need at least 3 intakes. 1 with valve and 2 with caps
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Unread 02-06-2013, 11:21 AM   #4
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I think you'll find there are a million different combinations different people have had success with. From my reading on the forum, I think the majority of people have gone with 3 intakes of 3/4". That is what I went with and so far so good for me.

Good luck with your project. Please make sure to share pics when you finish.
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Unread 02-06-2013, 11:23 AM   #5
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I have 4 3/4 pipes. One has a ball valve and the others have caps. Only used it a couple times but if i remember right the last time it stayed at 250 exactly with just the ball valve being open. If I come across any more ball valves I'm gonna replace the nipple caps with it
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Unread 02-06-2013, 11:37 AM   #6
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If you're going to build a UDS, you absolutely have to read the UDS thread - you will learn a TON. And, don't over complicate it. The KISS principle applies here.
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Unread 02-06-2013, 11:38 AM   #7
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With four-3/4" clear openings I can easily reach 350°F, faster with more lit coals to start out with if that's where you want it to go.
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Unread 02-06-2013, 11:43 AM   #8
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I have 1 3" intake that I made a makeshift daisy wheel out of. Works great, I can cook as low as 225 and up to 450 with steady temps.ImageUploadedByTapatalk1360172625.289397.jpg
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Unread 02-06-2013, 11:51 AM   #9
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Quote:
Originally Posted by Garrett View Post
I have 1 3" intake that I made a makeshift daisy wheel out of. Works great, I can cook as low as 225 and up to 450 with steady temps.Attachment 75478

that is awesome! i would love that for my PCB!
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Unread 02-06-2013, 12:05 PM   #10
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Just finished mine a couple of weeks ago, and I went with 3-3/4, 2 caps and 1 ball valve. With 2 capped, and the ball valve open, I was holding steady at 225 with an outside temp of 20. With 2 open, I was at 325 and it was still slowly rising before I capped it.
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Unread 02-06-2013, 12:33 PM   #11
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I have 3 X 3/4" 2 nipples and one ball valve, I am about to build a new one with 1 3" intake.
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Unread 02-06-2013, 01:36 PM   #12
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Quote:
Originally Posted by Garrett View Post
I have 1 3" intake that I made a makeshift daisy wheel out of. Works great, I can cook as low as 225 and up to 450 with steady temps.Attachment 75478

what you did except use the whole bottom of the UDS
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File Type: jpg DSC00003.JPG (74.0 KB, 191 views)
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Unread 02-06-2013, 02:09 PM   #13
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with the vent at the bottom I think you may have some issues with ash clogging up your intake especially during long cooks.
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Unread 02-06-2013, 03:04 PM   #14
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One 1-1/2" intake with draft pipe, ball valve up high and easy to reach. I can reach 350* easy, run it half open it'll cruise 275* for hours, and my fire burns evenly. No need for 3+ separate intakes IMO, not to mention capped ones mounted down low just mean bending over which is a pain in the ass especially if your smoker is in a tight area. Like others said keep it simple man.
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Unread 02-06-2013, 03:04 PM   #15
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Quote:
Originally Posted by Freddy j View Post
that is awesome! i would love that for my PCB!
PM me and I will be glad to make one up and send it to you.
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