Interior surfaces are concrete blocks painted with an epoxy paint. The floor is a troweled monolithic, waterproof material. No areas for survival surgery on non-rodent species 3. Walls are concrete block with epoxy paint. Floors are monolithic and moistureproof.
Ceilings are moistureproof and sealed.
Lighting Fluorescent lights in waterproof fixtures are provided. Lights are on timers. Room air exchange rates are 10 - 15 changes per hour. Temperature control is by individual room thermostats. Humidity is recorded for the facility on a seven day humidity recorder.