The EFU Series are factory sealed, explosionproof and dust‑ignitionproof fluorescent light fixtures that are suited for any location where ignitable dust, fumes, gases, paint residue, paint powder or corrosive atmospheres are present, including inside a paint spray booth. The EFU's Class P ballasts feature a thermally‑activated protective device that guards against excessive voltage, internal ballast short circuiting, inadequate lamp maintenance and improper fixture applications.