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  1. #1
    Join Date
    Feb 2004
    Posts
    43

    Confused spiral ductwork help

    anyone have any tips on cutting spiral duct work so it looks good.

  2. #2
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,405
    plasma cutter
    sawzall
    jig saw

    if you need help marking a straight line around it, go to a welding shop and get a pipe tape... them are handy!
    "If you call that hard work, a koala’s life would look heroic."

    VETO PRO PAC, The Official Tool Bag of HVAC-Talk.com

    Testo... you guys rule!

  3. #3
    Join Date
    May 2005
    Location
    Western Kansas
    Posts
    266
    to cut it to length I use a kett shear...depending on diameter should be able to cut 99% of it, then use sawzall to cut seam. Cutting in registers I square from floor snap a chalk line on top and have a cardboard pattern, trace, use a 3/4" stepdown bit to start and use snips to cut them out, bulldog snips to cut the seams....don't do enough to justify a plasma cutter but a sawzall will work also.

  4. #4
    Join Date
    Dec 2001
    Location
    Southern Tier, NY
    Posts
    6,066
    plasma
    grinder

  5. #5
    Join Date
    Mar 2003
    Location
    PA/DE area
    Posts
    1,535
    If you are going to paint it get the stuff that you can paint,I forget what it is called ask supply house.
    It's NOT the BRAND,it's the company that installs it!!!!!

  6. #6
    Join Date
    May 2003
    Location
    chesterfield, michigan
    Posts
    93
    Quote Originally Posted by heatpumpguru View Post
    If you are going to paint it get the stuff that you can paint,I forget what it is called ask supply house.
    Its called Iron Grip and apply generoulsly it will shrink, depending on size of spiral dont cut the seams..the duct is under tension and the top and bottom of the cut will blow out, leave the seams and cut out your register taps, sprial duct is something not to be attempted if never done before...Ive ran litteraly miles of this style ductwork...hanging it to make it look professional and level is a experience in itself, many different ways i.e threaded rod, 16 gauge hanging strap with proper circumference bend, 1/2 belly band with companion flange and rod...I've seen some bad spiral jobs. As far as cutting follow the circumference of the pipe at your cut measurement and make hash marks with a sharpy and then follow up with a sawzall, its loud but quick..

  7. #7
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,405
    Also, you can get spiral that's made out of paint lock, or paint grip.. (probably a dozen other names too). Basically a metal with a primer already on it.
    "If you call that hard work, a koala’s life would look heroic."

    VETO PRO PAC, The Official Tool Bag of HVAC-Talk.com

    Testo... you guys rule!

  8. #8
    Join Date
    Feb 2004
    Location
    SW Florida
    Posts
    1,256
    We NEVER cut the seams. The spiral will warp and weaken, Also internaly mastic the connections and use a full circumfrence hanger strap to the top of the bar joists. There are many methods of cutting the pipe.

  9. #9
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,405
    Quote Originally Posted by zzonko View Post
    We NEVER cut the seams. The spiral will warp and weaken, Also internaly mastic the connections and use a full circumfrence hanger strap to the top of the bar joists. There are many methods of cutting the pipe.
    Wow, never cut the seams? Bet them are some looooooong trunk lines!

    Another "trick" is to throw a 1/8" pop rivet in the seam. Of course, best to do this before you do the cutting. I've done this a few times and it seems to work great to keep things together.
    "If you call that hard work, a koala’s life would look heroic."

    VETO PRO PAC, The Official Tool Bag of HVAC-Talk.com

    Testo... you guys rule!

  10. #10
    Join Date
    Feb 2004
    Posts
    43

    Thumbs up spiral ductwork

    hey thanks to all, i got some good advice.

  11. #11
    Join Date
    Feb 2004
    Location
    SW Florida
    Posts
    1,256
    Quote Originally Posted by amickracing View Post
    Wow, never cut the seams? Bet them are some looooooong trunk lines!

    Another "trick" is to throw a 1/8" pop rivet in the seam. Of course, best to do this before you do the cutting. I've done this a few times and it seems to work great to keep things together.
    To clarify.

    We do cut the pipe for length. But we do not cut the seams for the grill boxes

  12. #12
    Join Date
    Feb 2004
    Location
    chicago suburbs
    Posts
    4,422
    4 1/2" grinder with cut-off wheel............and safety glasses.

    <-----like these
    FILL OUT YOUR PROFILE!!

  13. #13
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,510
    electric side cutting shears
    work great and can cut to 18 gauge

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