Extending Register Boot Below Soffit


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Old 01-05-23, 08:42 PM
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Extending Register Boot Below Soffit

I have two vent registers located along main trunk lines in my basement which are now framed inside soffits, and I need to lower them:





I bought two of these rectangular starting collars from HD and I don't understand how the tabs work. Why aren't they single-layered like all the round collars I've seen? Do I just insert them into the hole and bend back the perpendicular ends of each tab? Seems like that would leave kind of a bump along the outside edges of the rectangle. Or should I snip off the extra folded-back metal and screw through the remaining flaps into the trunk? Is there a third method I'm not seeing?
 
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Old 01-05-23, 09:30 PM
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You stick it in, put your arm in, and bend all the tabs down. Then foil tape the edges of the flange.
 
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Old 01-05-23, 10:48 PM
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Got it. So having a small bump around the edge due to the double-layered metal there is expected?
 
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Old 01-06-23, 05:19 AM
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Yes.
 
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Old 01-06-23, 07:37 AM
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Right on, thank you!
 
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Old 01-06-23, 08:17 AM
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Make sure you use foil tape and NOT gray duct tape. You can also use duct putty to seal any minor openings and stop air leaks.
 
 

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