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The Family Handyman on MSNHow to Install a Duct Booster FanIf the duct is a standard size, remove the register and drop the fan into the boot. Secure it to the floor on each side with ...
Learn more. As a category, these fans perform better in terms of airflow than fans built to fit a 3-inch duct. These models do a good job of evacuating air through the duct while keeping noise low.
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