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Old 03-03-2010, 12:32 PM   #1
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cutting duct before or after crimping


this may be a stupid question but should you cut a duct with thin snips before or after crimping? one would think before but i find it that the snips can twist the crimping rail or groove or whatever you call it to the point of becoming uncrimpable. so then it would have made more sense to have crimped it before cutting and then cut it.

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Old 03-03-2010, 02:53 PM   #2
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cutting duct before or after crimping


I snap my round duct together. Cut to size than crimp.

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Old 03-03-2010, 03:11 PM   #3
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cutting duct before or after crimping


As said, cut to size, put together then crimp.
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Old 03-03-2010, 03:14 PM   #4
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cutting duct before or after crimping


Can cut first before you put it together too. But i think we both agree crimping comes after assembly.
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Old 03-03-2010, 03:16 PM   #5
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cutting duct before or after crimping


does "snap" mean fit the flat edge into the groove to make it round and "crimp" mean narrow one end to make it male so it can fit into the female ? because i am a little confused ...

in other words, do you cut when the duct is FLAT or when it is snapped together to be round ?

thanks

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Old 03-03-2010, 05:04 PM   #6
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cutting duct before or after crimping


Cut it when it is flat.

If your snips are folding the metal over instead of cutting the metal. Either your snips are worn out, or the pivot screw and nut are loose. . Or they are low quality snips.
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Old 03-03-2010, 05:11 PM   #7
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cutting duct before or after crimping


thanks. that makes sense.
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Old 03-05-2010, 06:04 AM   #8
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cutting duct before or after crimping


At the ends of the ductwork where the female would accept the male into it...sometimes after crimping you might have to widen that area with a small screwdriver (not a lot) to widen it to accept the male end. After you snap the duct together I always slap the sides of the round....if it's not connected properly...it will pop apart. Then crimp it as the guys said above....good luck.

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