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Post subject:concentric diffuser developement
 Posted: Sep 21, 2005 - 01:33 AM #3709
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Joined: Sep 10, 2005
Posts: 7
Location: el paso
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 i have been wondering if i could make a concentric diffuser box by simply making an offset rectangle to round and simply enclosing it with a box made of ductboard. would that be possible or are we looking at airflow problems. it would really save money to fabricate this than to buy one. i'm currently paying about $300 for a concentric for a 7.5 ton unit. the price difference is amazing! |
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Post subject:RE: concentric diffuser developement
Posted: Sep 21, 2005 - 02:32 AM #3710
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Power User
Joined: Feb 01, 2004
Posts: 820
Location: Mobile, Alabama
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Sounds intresting. I have built many, all metal, in various sizes and shape configurations with success. For the most part, the ones I have built were insulated with liner and sometimes wrapped depending on the shape and requirements. If these were used with package units, I m assuming they would be, that there would not be so much resistance that the RTU could not overcome it. I would streamline my design in most all situations to keep the system effiecient.
Let me know how it turns out and welcome to the shop! |
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Post subject:RE: concentric diffuser developement
Posted: Sep 21, 2005 - 02:55 AM #3711
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Joined: Sep 10, 2005
Posts: 7
Location: el paso
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Quote:
Sounds intresting. I have built many, all metal, in various sizes and shape configurations with success. For the most part, the ones I have built were insulated with liner and sometimes wrapped depending on the shape and requirements. If these were used with package units, I m assuming they would be, that there would not be so much resistance that the RTU could not overcome it. I would streamline my design in most all situations to keep the system effiecient.
Let me know how it turns out and welcome to the shop!
thanks for the 411 pricer, really helps! is there an easier way to actually make this diffuser without having to form a rectangle to round! i really enjoy forming this fitting though(rect.-round). triangulation just sucked me in when i finally figured out how to use it, thanks to this website. i could make the basic layout and just keep a pattern but just in case is there a quickie way to do this. thanks for the speedy answer! |
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Post subject:RE: concentric diffuser developement
Posted: Sep 21, 2005 - 03:03 AM #3713
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Power User
Joined: Feb 01, 2004
Posts: 820
Location: Mobile, Alabama
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coolarrow420 wrote: Quote:
Sounds intresting. I have built many, all metal, in various sizes and shape configurations with success. For the most part, the ones I have built were insulated with liner and sometimes wrapped depending on the shape and requirements. If these were used with package units, I m assuming they would be, that there would not be so much resistance that the RTU could not overcome it. I would streamline my design in most all situations to keep the system effiecient.
Let me know how it turns out and welcome to the shop!
thanks for the 411 pricer, really helps! is there an easier way to actually make this diffuser without having to form a rectangle to round! i really enjoy forming this fitting though(rect.-round). triangulation just sucked me in when i finally figured out how to use it, thanks to this website. i could make the basic layout and just keep a pattern but just in case is there a quickie way to do this. thanks for the speedy answer! |
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Post subject:RE: concentric diffuser developement
Posted: Sep 24, 2005 - 06:02 AM #3725
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Joined: Sep 10, 2005
Posts: 7
Location: el paso
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I like to use the KISS method in which Bud tells us about in the latest issue of Snips Mag. I like things simple and symetrical. I tend to work better and have better ideas when I have purpose. If you could give me some numbers on exactly what you want to build, may be I could help more? I would be happy to share information on how I would build and design it. I have a picture of a concentric box I built some where here at the shop. I will try to find it and post it so you can see some of my work and ideas.
KISS works for me.and basically what i'm looking at is this: i need a concentric with 2 18" round openings on top. it needs to fit a 24"x48" opening so that i don't have to modify the t-bar(suspended ceiling) to make it fit. the ones i buy are 48"x36", so i have to modify the t-bar which is a pain and time consuming. the height has to be about 1'.i'm thinking an offset rectangle to round about12"x36" to 18" round and then just making a simple box 24"x48" andthe same height and mating them so that i have the rect. to round offset to one side and i can put a round tap on the other side and i have a uniform gap around the rect. to round for the supply grills and i can fabricate a filter rack for the return and simply cover it with eggcrate. what do you think? |
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Post subject:RE: concentric diffuser developement
Posted: Sep 24, 2005 - 06:22 PM #3731
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Power User
Joined: Feb 01, 2004
Posts: 820
Location: Mobile, Alabama
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| [quote="coolarrow420"] Quote:
I like to use the KISS method in which Bud tells us about in the latest issue of Snips Mag. I like things simple and symetrical. I tend to work better and have better ideas when I have purpose. If you could give me some numbers on exactly what you want to build, may be I could help more? I would be happy to share information on how I would build and design it. I have a picture of a concentric box I built some where here at the shop. I will try to find it and post it so you can see some of my work and ideas.
KISS works for me.and basically what iI think it sounds good. Are you going to use duct board for the outside of the box? If the system is short (the concentric installed under the package unit) would there be a better way than building an offset rectangle to round? Could you build an offset trans. from the grille to the top of the duct board box, end cap it and install an 18" collar into the cap? That would seem to be a bit more cost effective and I do not think it would be that big of a loss.
Is there such a thing as a concentric grille that is made similar to a filter grille in the center? I have never used such and if I had I never noticed it while building in the shop. |
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Post subject:RE: concentric diffuser developement
Posted: Sep 30, 2005 - 05:17 AM #3751
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Joined: Sep 10, 2005
Posts: 7
Location: el paso
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i don't exactly know if there are concentric grilles that i can buy for the supply but what i was thinking was buying two 6" x 36" one way diffusers and two 6" x 24" one way diffusers and putting them in the spaces created by the simple box over the square to round and fabbing a filter rack with a lid made of eggcrate connected with a snap lock and piano hinge so that it could facilitate easy filter changes. sound good? don't really want to break this out to the boss until it's an absolute diamond in the rough that costs the same as a cubic zirconia! lol!
p.s. thanks for all your help pricer. scrolling through the site i see your a master concentric fabber and any help you offer me is considered golden. thanx! |
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Post subject:RE: concentric diffuser developement
Posted: Oct 02, 2005 - 10:28 PM #3760
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Power User
Joined: Feb 01, 2004
Posts: 820
Location: Mobile, Alabama
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[quote="coolarrow420"]i donThank you very much, I only wish I could give as much as I take. I would like to see your work, I am sure I can learn from it as well. I am starting a very unique curb adapter project 10/3/05. It is a filter curb for a hospital in my area. I built a curb adapter last week that went from a Carrier 5 ton to a large exhaust fan. It really turned out well, for some reason I was able to overcome some of my usual welding frustrations, not that my welding skills are bad, I am really just counting hairs.
Good is the enemy of better and better is the enemy of the best, I must keep pushing for that "best " part then the cycle can repeat itself and the evolotion can continue. With much wisdom comes much sorrow. Keep fighting the good fights and continue to dream the impossible. |
_________________
Pricer
Many Minds, Many Hands, Many Solutions
The Curb Shop LLC
www.thecurbshop.com
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Post subject:RE: concentric diffuser developement
Posted: Oct 03, 2005 - 05:10 AM #3767
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Joined: Sep 10, 2005
Posts: 7
Location: el paso
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| that project really sounds interesting. wish i was there to see it as soon as i try it i'll send some pics! |
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