Booster fans ever work?

Customer wanted to know why they didnt have much airflow on 2nd floor, said they were told when they bought the house there was a booster fan to get more air upstairs, were told that not much else could be done unless they tore out walls and redid the ductwork.

Found this booster fan, 6" diameter, inside the 10" pipe leading to the 2nd floor trunk. The booster was placed less than a foot from the A-coil on top of the furnace. Removed the booster fan and lo-n-behold, LOTS more air now gets up to the 2nd floor.

Q-Anyone ever have a booster fan that actually improved airflow? I have seen only a few and they have never been placed properly, they end up just getting noisy and annoying for the homeowner.

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