What size breaker do I need for bathroom fan?

Most bathroom fans use a 15-amp and 14-caliber cable circuit breaker.Because of the increase in output power, heating fans usually need a 20-amp and 12-amp cable circuit breaker.Use the electrical specifications of the manufacturers to confirm this.A 15-amp circuit breaker is used by most bathroom fans. Fans with heaters need a 20-amp circuit breaker and 12-gauge wiring. If you want to confirm this, use the manufacturer's electrical specifications.