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I used Nashua tape after watching a video on youtube. I think its 324 A aluminium foil tape, duct cleaning guys used that our house and recommended that as well. Here is a link of video. Cheers !


You can inspect using a toilet paper for wind blowing and sucking for return ducts. I found a video which showed testing and using a tape for fixing. Hoping this helps.. Cheers !


Yes splitting an 8” duct to 2 separate 6” ducts is an appropriate size transition, since it is a master the air will be going to the same areas while the bathroom door is open. I usually add dampers to all my vents it costs more but makes balancing easier.

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