What is Booster Fan?
An interlocked in-line fan, rated for lint-laden air, that runs only when the dryer runs. It is the correct engineering answer to a developed length that genuinely exceeds what the appliance and code allow and cannot be shortened. It is the wrong answer to a duct that is simply dirty — a fan pushing air through a blockage masks the symptom and adds a motor that will foul. It also introduces a recurring cleaning requirement of its own.
