Connecting air duct to air register

Discussion in 'HVAC Heating & Cooling' started by monkeyshine, Oct 8, 2013.

  1. monkeyshine

    monkeyshine New Member

    Messages:
    11
    Location:
    Houston
    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:
    GarryLove1.jpg

    This is what the "elbow" or whatever that is looks like:
    GL1.jpg GL2.jpg GL3.jpg

    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. monkeyshine

    monkeyshine New Member

    Messages:
    11
    Location:
    Houston
    This is the original air duct (similar from another room)

    GL5.jpg

    Any ideas guys?
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