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Most duct booster fans are not designed to run continuously, though some models can be programmed for constant operation. Typically, they are controlled by the user via a switch, controls on the unit itself, or by being wired to the HVAC system's thermostat. Wiring the fan to a thermostat allows it to run automatically only when heating or cooling is active, which saves energy and is an effective way to activate the fan only when needed to address issues like uneven room temperatures.

Your bathroom exhaust fan shouldn't be loud. However, bath fans come in a wide variety of models, price points, and loudness characteristics, and yours may be louder or quieter than others you notice. Economy models tend to be the noisiest, with levels of 4.0 sones or more, which is about the sound of an electric shaver, while some high-end models can be barely audible. 

Yes, you can lubricate a ceiling fan without taking it apart. Ensure the fan is off and clean any dust around the motor area before lubricating. Apply several drops of machine oil to the top of the motor housing where the shaft enters or via the oil ports if available. Regular lubrication helps maintain smooth operation and reduces noise. If your fan lacks an accessible oil port, it may require disassembly or professional maintenance.

There are many types of ceiling fans, from self-automated smart ceiling fans to outdoor ceiling fans that provide additional comfort to your patio. What you choose all comes down to function and personal taste.

Consider your ceiling height when selecting a ceiling fan. Rooms with ceilings under eight feet high will do well with low-profile ceiling fans, also known as flush-mount or hugger ceiling fans. If your home has cathedral ceilings or ceilings between 10 and 25 feet high, you’ll need a large ceiling fan with a heavy-duty motor to get adequate air circulation.