An insect-infestation prevention device and a fiber optic telecommunications equipment including an insect-infestation prevention device is disclosed. The fiber optic telecommunications equipment includes a housing with a main housing portion defining a first transverse wall, a front wall, a rear wall, a top wall, and a bottom wall, cooperatively defining an interior. A cable exit/entry is provided opening on one of the front wall, the rear wall, the top wall, and the bottom wall. A removable insect-infestation prevention device is located adjacent the cable exit/entry opening, the insect-infestation prevention device including cable openings communicating with the cable exit/entry opening. The cable openings of the device are sized to accommodate fiber optic cables exiting or entering the housing while limiting the amount of free space around the fiber optic cables to prevent insects from entering the housing. A removable cover mounted to the main housing portion defines a second transverse wall of the housing and captures the insect-infestation prevention device against the main housing portion.