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Old 10-23-2012, 07:00 PM   #16
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Location: Southern Michigan
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Enlarging two 6" runs

You could always skip and the extra work with ducting and add a couple of booster fans, control them so they turn on with the furnace fan, much easier.


When its all said and done there is usually more said than done
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Old 10-25-2012, 09:35 AM   #17
Join Date: Nov 2011
Location: Raleigh, NC
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Enlarging two 6" runs

A booster fan seems more like a band aid than a permanent fix.

Plus for, the same amount of money or perhaps less it would be better to invest in fixing the actual problem and not rely on a solution that requires more electricity and will have to be replaced in a few years.
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Old 01-10-2013, 01:44 PM   #18
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Enlarging two 6" runs

For a recap, I ended up replacing most of the flex and things are much better.

I ran 10" hard pipe from the plenum to a 10x7x7 wye located after it entered the soffit using a more gradual bend.

Then I ran 7" hard pipe from the wye to two 90s and reduced it to the 6" flex.

(There wasn't enough room in the soffit for 10" pipe -- otherwise I would have run further.)

I then pulled the 6" flex very tight, secured all the connections well, and insulated as needed.

Postmortem showed several holes in both flex runs and at least four feet too much flex.

Air flow is much better and temperature is more consistent with the rest of the house.

In the future I'll replace the remaining 6" flex with 7" hard pipe when we replace the ceiling in the garage and re-insulate.

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