A bathroom mirror that stays fogged long after a shower may point to ventilation that is undersized, poorly routed, or rarely used. A fan upgrade should move moisture outdoors rather than into an attic or wall cavity.

Check the existing duct

Find where the current duct terminates and whether its size and route suit the replacement. Long or restrictive runs can reduce airflow, so read the manufacturer's installation guidance before selecting a fan by room area alone.

Compare controls and noise

A timer or humidity control can help the fan run long enough after bathing. Compare sound ratings, but also consider whether the control can be wired safely and whether the fan is accessible for cleaning.

What to compare before you buy

  • Verify duct size, route, and outdoor termination.
  • Compare airflow guidance for the bathroom's dimensions and layout.
  • Use a qualified electrician when wiring or code requirements are uncertain.

Measure first, read the care and installation guidance, and compare the complete cost of ownership. A product that fits the room and the household routine is usually a better choice than one selected from a photograph alone.