A mobile cleanroom is pre-fabricated, pre-tested and certified. They are often built inside cargo container and can be moved to the location where it is needed. Mobile cleanrooms are stand-alone enclosures containing their own mechanical system for basic comfort cooling or for precise temperature and humidity control, emergency power, lighting, water, ancillary support systems and a filtration system to meet the specified cleanliness levels, including HEPA or ULPA filtration for applications requiring a certified cleanroom environment.