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Do Duct Booster Fans Work

Yes! Immensely. Most especially on long runs in 6" Pipe.

Even in 10X14 duct work, at about 24 feet, airflow begins to drag.
 
For whatever it is worth, I used Cloudline S series fans from AC Infinity. They have been in use for years and work. I had problems with 1 of the fans I installed, it was replaced for free with a newer model by the manufacturer.

 
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