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Old 05-18-2011, 10:54 AM   #16
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Air conditioning duct work


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Originally Posted by Doc Holliday View Post
Butt joint more refers to carpentry. http://en.wikipedia.org/wiki/Butt_joint

I think what BT might mean is those boxes are butted together verus being transitioned from one to the other.

I don't think that tape is meant for air leaks. From what I understand it is mainly used for insulating commercial metal duct, on the insulation itself and not on the metal.
Really? I always assumed they were directly for the metal.

I also Siliconed all my collars and major joints, then taped on top of that.
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Old 05-18-2011, 11:12 AM   #17
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Really? I always assumed they were directly for the metal.

I also Siliconed all my collars and major joints, then taped on top of that.

Your's was the first time in my over a decade of seeing insulation tape used on metal connections. Nashua UL listed Foil tape, hardcast (foil grip)tape, hardcast aka duct sealant. One or the other by code.







Your system would not pass inspection down here but since you're doing it yourself I guess inspections are out of the question.
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Old 05-18-2011, 02:45 PM   #18
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Air conditioning duct work


I see, upon closer inspection it looks like you be right... the tape around the collars off the main trunk started peeling and not holding too well, I peeled them off and applied duct sealant mastic, the flat seems on the corners are holding great, i could not peel them off even if i wanted too. I'll prob. go over them with the proper foil tape a few rows thick just for safe measure anyhow.
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Old 05-18-2011, 03:57 PM   #19
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A butt joint, is any joint that the pieces are just placed/butted together. Its a term often used in welding.

You said 36" from air handler to the center of the start collar. So by the pic, it looks like about 18" from the butt to the center of the start collar. it may have a poor air flow from those 2 runs then.
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Old 05-18-2011, 04:02 PM   #20
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Originally Posted by beenthere View Post
A butt joint, is any joint that the pieces are just placed/butted together. Its a term often used in welding.

You said 36" from air handler to the center of the start collar. So by the pic, it looks like about 18" from the butt to the center of the start collar. it may have a poor air flow from those 2 runs then.

How far should the first runs be away from the AHU ? If I decide to re-do the transition pc, i will be able to extend it further away.
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Old 05-18-2011, 04:15 PM   #21
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The 3' is more then fine from the air handler. Its the butt joint that presents a problem. Make it a true transition, and the start collar locations are fine.

I like to try and be 2' from a transition, but its not always possible, and if the transition is mild(less then 15 angles) even 12" is fine.
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Old 05-18-2011, 08:52 PM   #22
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Air conditioning duct work


Sorry if i completely jacked your thread js.craig, though- this should still be relevant to your project and may help.

Beenthere, I Redid my transition, after some trial and error and got it all sealed up.

thanks for the suggestion.

-alec





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Old 05-18-2011, 09:00 PM   #23
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The world's first Sherman Tank transition!!

You might want to consider adding an access door in the return air just before the air handler. This way you will be able to get into the coil to inspect and/or clean it.

Nothing fancy to add it in needed, just some sheet metal snips and hardcast or tape around the edges. And a marker to trace the edge to cut where you will mount it.

Sorry, I'm having difficulty finding an image of the thing but it's not expensive and it will save you headache later on down the road. Wherever you got your hvac equipment from will sell it.
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Old 05-18-2011, 09:04 PM   #24
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Air conditioning duct work


Actually if you can easily access the coil, especially on the return air side as that is the side that will eventually collect dust and debris so the left side if in front of the system, by just removing the service panel doors of the air handler than no need for an access door. You can clean it from there.

Not too bad for a DIY'er and I like your enthusiasm. Good work all in all!
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Old 05-19-2011, 03:15 AM   #25
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Air conditioning duct work


That transition will help air flow tremendously, turbulence will be minimized and sound/noise level reduced in the duct work.
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