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  #1  
Old 08-24-2021, 06:43 PM
SabreFlyr SabreFlyr is offline
 
Join Date: Sep 2015
Location: Marion, IN
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Default Straightening curved fresh air vents

After trimming the forward 3/4" of one of my fresh air vents per page 29-21, I still have a substantial curve that takes significant force to flatten. I'm concerned that, even with a good adhesive, it might still pry itself free at the forward end. I'm considering clamping it to the top of my workbench while using a hot air gun (Steinel; capable of somewhere north of 800°F) to soften the plastic. Any reason not to try this? Secondly, how much heat should I consider?
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  #2  
Old 08-24-2021, 07:41 PM
VA Maule VA Maule is offline
 
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Gently warm it with a heat gun a little at a time until it's plastic (verb) enough to take a new set . Let it cool against flat surface , in a few minutes it aught to be good to go.
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  #3  
Old 08-24-2021, 08:06 PM
Taltruda Taltruda is offline
 
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800 degrees is too much. Harbor freight sells a cheap heat gun, but you might have luck with a blow drier too
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  #4  
Old 08-25-2021, 04:58 AM
SabreFlyr SabreFlyr is offline
 
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Quote:
Originally Posted by Taltruda View Post
800 degrees is too much. Harbor freight sells a cheap heat gun, but you might have luck with a blow drier too
I should have added that it is fully adjustable. I'll definitely start on the lower end of its range.
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  #5  
Old 08-25-2021, 04:00 PM
abwaldal@gmail.com abwaldal@gmail.com is offline
 
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You have probably seen 2 and 3" conduit used in electrical work. We use a brush burner torch and heat that big thick stuff slowly and when it is in a plastic state just bend it to where we want. 90 degrees, around corners, you name it it goes.
Plastic is very malleable if you take care
Heat away. Art
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  #6  
Old 08-25-2021, 05:24 PM
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emsvitil emsvitil is offline
 
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Would hot (boiling?) water pot do the trick?
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  #7  
Old 08-25-2021, 05:43 PM
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KeithB KeithB is offline
 
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Not trusting adhesive, I added several rivets on the perimeter.
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  #8  
Old 08-25-2021, 06:30 PM
SabreFlyr SabreFlyr is offline
 
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Some good thoughts and suggestions! I'll have to mull them over and let you know which way I go and how it works out. Will probably tackle that tomorrow.

P.S.: DR, must have been a slow news day to put this one on the front page!
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  #9  
Old 08-26-2021, 01:30 PM
PatMac PatMac is offline
 
Join Date: Feb 2021
Location: Louisville
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If you have any scrap, test. If not, creep up on it w/ lower heat first. Clamping a conformed piece to it when cooling might help prevent warpage....
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  #10  
Old 08-26-2021, 07:47 PM
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FasGlas FasGlas is offline
 
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EZ fix.. You can use a cheap HF heat gun. Just wave it back and forth over the area you want to reshape until you feel the glass get pliable, takes only 10 ~ 20 seconds. Lay the piece on a flat surface and use a wet rag to cool it back down. Done.
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