A mounting apparatus includes a securing plate and a fan. The securing plate defines an engaging slot and a retaining slot. The fan includes a first sidewall attached to the securing plate. The first sidewall includes a first engaging member and a second engaging member. The first engaging member engages in the engaging slot, to prevent the fan from moving in a first direction substantially parallel to the securing plate. The second engaging member extends through the retaining slot from the front of the securing plate to the back of the securing plate, and engages with the securing plate, to prevent the fan from moving in a second direction substantially perpendicular to the securing plate.