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post #1 of 10 Old 06-11-2015, 08:18 PM - Thread Starter
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Working with Flex duct

Does anyone have a detailed build thread, books or good internet tutorials on working with insulated flex duct (http://www.homedepot.ca/product/flex...25-foot/959965)

Couple of things I just can't find information on

1) What/how the connection is made to main traditional metal supply duct
2) If/how I can make a connection to an existing return that is using the joists/thermopan. Its already protrudes into my theater space to go upstairs. So was thinking about a joist muffler from there to the back of the theater (12ft'ish) and running flex.

Thanks
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post #2 of 10 Old 06-11-2015, 09:57 PM
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post #3 of 10 Old 06-12-2015, 05:53 AM
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Don't forget the collar to connect the duct to the trunk.
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post #4 of 10 Old 06-12-2015, 08:55 AM
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This guy, "The Sheet Metal Kid", has a great tutorials on lots of things related to HVAC installation. Here is the one for flex duct.


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post #5 of 10 Old 06-12-2015, 11:24 AM - Thread Starter
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Quote:
Originally Posted by DaveClement View Post
This guy, "The Sheet Metal Kid", has a great tutorials on lots of things related to HVAC installation. Here is the one for flex duct.


https://youtu.be/IasBJrE22bc
Okay so still use a metal connection to the main trunk and then convert to flex. That makes sense. I'll give the video a watch and see what other tidbits are to be had. Thanks!
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post #6 of 10 Old 06-14-2015, 05:27 AM
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I'll add another couple of tips, from when we redid my HVAC.


Come off the top of a HVAC trunk with a top take off. No need to add a ninety degree turn with the flex duct.


Put two sheet metal screws in, close to 180 degrees apart, so that is mechanically impossible for the heavy duty HVAC cable ties
to ever slide off.


And slather pipe dope over the metalized tape. Eventually the tape's adhesive dries out and this ensures the tape stays in place
over the long term.
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post #7 of 10 Old 06-14-2015, 04:14 PM - Thread Starter
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Quote:
Originally Posted by Tedd View Post
I'll add another couple of tips, from when we redid my HVAC.

Come off the top of a HVAC trunk with a top take off. No need to add a ninety degree turn with the flex duct.
over the long term.
If it comes off the top, wont it need a 90 deg angle to...go where it needs to go?
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post #8 of 10 Old 06-14-2015, 06:07 PM
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A top take off looks like this. :
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post #9 of 10 Old 06-17-2015, 02:34 PM - Thread Starter
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Quote:
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A top take off looks like this. :
Ah. I assume its poor practice to come off the bottom of the main trunk and do a 180 turn? Not a lot of room to work up top.
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post #10 of 10 Old 06-17-2015, 07:13 PM
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Can you unfold the joiners and drop a section of the HVAC trunk? You could use a drywall hoist to lower the tin to cut
the opening and fold the tabs and tape, then raise and reinstall the tin.

A 180 is occasionally done, but I doubt it would be considered "good practises". If you go this route, I'd use tin for the 180 and then go to
flex.
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