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Old 01-06-2014, 07:17 PM
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What to use as a ac duct?

I am adding an under dash generic ac unit, but i am building it into the dash The question I have is? I need to duct from the unit to the back face of the dash. The top piece needs to be z shaped. I don't want to use metal because the back of the gauges will defiantly be refrigerated. it a tight fit. Do they sell plastic in sheet form? where do i get a small piece like this? all i can think of is all the old phone booths with the plastic covers. that stuff would bend in the brake.
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Old 01-06-2014, 10:06 PM
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I use cardboard stock then coat it with fibreglass resin and lightweight cloth after the duct is formed. Lightweight tabs cam be glassed in for mounting
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Old 01-07-2014, 07:08 AM
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maybe the ABS plastic Auto Stereo shops use for faceplates etc could be heated up to bend , used this stuff a lot in my stereo install days
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Old 01-07-2014, 07:45 AM
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Originally Posted by BOBCRMAN@aol.com View Post
I use cardboard stock then coat it with fibreglass resin and lightweight cloth after the duct is formed. Lightweight tabs cam be glassed in for mounting
go to a local fab shop and they'll probably give you a sheet of cardboard for free. it'll probably say alro steel on it but it will be real cardboard. they come in 4'x8' sheets and are probably 1/4" thick. pretty durable stuff
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Old 01-07-2014, 03:59 PM
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Why the heck didn't I think of that? I have no idea how to glass yet. I will see if I can find some abs sheet. local or flee bay.
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Old 01-07-2014, 04:25 PM
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I have used plastic from Home depot that you use for tub and shower surrounds. It will form easy with a heat gun and you can glue it together if needed.
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Old 01-07-2014, 04:36 PM
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Check with home depot or Lowes they used to sell pelxy glass. I broke a pane of glass on my front door, bought some plexy glass at home depot, cut it with a recip saw an put it into the frame. It can be cut glued, bent also.
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Old 01-07-2014, 04:56 PM
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Why the heck didn't I think of that? I have no idea how to glass yet. I will see if I can find some abs sheet. local or flee bay.
if you have paper mached a pinata you should be able to use fiberglass
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Old 01-07-2014, 06:39 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com View Post
I use cardboard stock then coat it with fibreglass resin and lightweight cloth after the duct is formed. Lightweight tabs cam be glassed in for mounting
i've used this method too.
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Old 01-08-2014, 05:21 PM
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plumber pvc pipe..
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Old 01-12-2014, 11:53 AM
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Ever thought maybe I should have never tried this?

Ok, i found a sheet of plexi-glass i think, it is like 1/8" thick and bendable. it's a new sheet like 38 x 52 for $10.00 yep $10.00 @ the surplus store. Pretty fun to work with this material. give it a quick swipe with the propane torch and put in the break and it will hold its shape. This fit up is tight. I even have to shorten the electrical studs on one of the meters. the flange also had to fit right in between the gauges housing and the top of vent holes. IT FREAKING FITS!!!! now the question is? I had to rotate the ac thermostat switch 90 deg to have enough room. will that matter? I'm ready to weld this mess shut. i also have to find some way to weld studs to the back of the sheet metal without a stud gun for the speedo?
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Old 01-12-2014, 02:06 PM
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The carboard and fiberglass method is by far the easiest to fabricate and offers the most options as far as design. Fiberglassing is not hard and once learned opens up a whole new world of design options.

Vince
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Old 01-15-2014, 06:40 PM
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Got the interior ac mockup setup done.

On to the next challenge. Hey, if anyone knows if rotating the thermostat switch will be an issue please please let me know now. I used a new generic under dash ac unit that has the switches in the front. Onto creating a battery box in the rear.
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