Over time, dust builds up in the fan slits and makes it work less efficiently and effectively. You can test the fan's strength by placing one square of toilet paper in front of it when running to see how much air it is drawing in (however, this may only show you how strong a fan you have installed). If replacement isn't an option, give the fan a good cleaning with a vacuum hose fitted with a brush attachment. It's also possible there could be a blockage in the exhaust pipe. To clean this, you can use a dryer vent brush, which has a flexible long handle with a brush on the end.
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