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Thread: Connecting air duct to air register

  1. #1
    DIY Junior Member monkeyshine's Avatar
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    Feb 2013
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    Default Connecting air duct to air register

    Good evening all -

    Sorry for the rookie question, but I've come across an issue with my air duct to air register which I was hoping the pros on the site could please answer. More than likely a very simple answer.

    I currently have this set up which is a 7+" OD (OD is just a hair over 7" - maybe 7.125/7.2) air duct which I'm trying to use a 7" to 6" reducer to accommodate a 6" air register:
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    This is what the "elbow" or whatever that is looks like:
    Name:  GL1.jpg
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Size:  43.1 KBName:  GL2.jpg
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    For whatever reason, the ridges on the air duct (it's an old set up obviously) will not accommodate the 6" air register - even with the reducer. The 7" side of the reducer will not fit properly to the 7+" OD air duct. Seems like HVAC work is never plug n' play. The "elbow" appears to be attached to a long sheet metal pipe. Does anyone have any ideas - any help would be appreciated! Thanks in advance!

    Things I've tried thus far:
    1. 7" to 6" reducer
    2. Sheet metal (rolled and crimped) with self tapping screws unfortunately with no luck either.

  2. #2
    DIY Junior Member monkeyshine's Avatar
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    Default

    This is the original air duct (similar from another room)

    Name:  GL5.jpg
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    Any ideas guys?

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