ULPA filter stands for Ultra Low Particulate Air. Growing market demand from advanced science and technology led to development of ULPA filters which provide a minimum of 99.999% efficiency (0.001% maximum penetration) on 0.3 micron particles for achieving better cleanliness classes and cleaner working environments.
These are used for ultracleanrooms, where contamination levels have to be controlled at levels better than that which can be achieved with conventional HEPA filters.