Dust is the number one killer. Lint and dust wrap the blades and pack the motor housing, so the motor works harder, runs hotter and wears out early. Half the “dead” fans we see are motors that cooked slowly under a blanket of dust that a yearly clean would have prevented.
Capacitors fail, bearings dry out, switches and timers die. These are genuine repairs: a technician replaces the failed component and the fan runs like new for a fraction of replacement cost. The skill is knowing which fault it is without guessing – which is exactly what the $99 inspection answers.
Sometimes the fan is fine and the ducting is not. A crushed duct, a blocked discharge grille or a jammed damper flap can strangle a healthy fan. Repairing the fan would fix nothing – we check the whole run before we quote anything.