A clean room is a building that is constructed to provide for a
clean environment for various fields of research such as
biological or chemical research, and also for the manufacturing
of sensitive components. These purposes often involve
environmentally sensitive processes that require an
uncontaminated environment. These processes are conducted with
procedures that are intended to prevent the contamination of the
environment with foreign matter like airborne particles and
bacteria; these procedures range from a strict employee dress
code, rigorous washing, environmentally isolated lockers and
chambers, air showers, and thorough cleaning techniques. The
design of the clean room itself incorporates HEPA and ULPA
filters to facilitate an air flow through the facility that
keeps out contaminants, generally with a positive pressure flow
to push contaminants out, or a negative pressure system that
keeps everything in, depending on the design objectives. An
example of scientific research that would require a clean