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January 23, 11:14 AM [GMT -5]

This is disappointingly lacking in information.

1. It appears that all he is doing is raising the duct, from its original position to just under, maybe even touching, the floor joists. I this this might result in more noise as the ducts bang against the joists as the HVAC system comes on and either heats up or cools off.
2. Although not an exact science, and I'm sure that every installer does the math a little differently, the volume of your ducts should be a function of the size of your furnace and house, and how far and how many runs you have. Altering a main in the basement near the system might negatively impact its performance.

The question is, can I take a duct that is approximately 32 inches wide, or two joist bays, and (let's say) 12 inches deep or high, and make it 64 inches wide and 6 inches deep?
- This might make it really hard to hang a ceiling, but I'd gain 6 inches.

January 15, 11:25 PM [GMT -5]

Hi,
I was just curious on how shallow these new ducts can be? Ours currently are spanning approx 25 feet in a strait shot.
Any feed back would be appreciated.
Thank You,
The Flemings

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Home Repair: How to Flatten Basement Air Ducts to Gain Space

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