Laser Particle counter measurements typically show that more than 99o/o of the particles
suspended in indoor air are one micron (1/1,OO0,OOO of a meter) or smaller in size. EPA calls
these *lun9-damaging” particles, because they can lodge deep in the lungs when inhaled. The
ability of HEPA filters to capture particles this small is what sets them apart from other types of
filters’ Regulations developed by EPA, OSHA, CDC and other federal, state and local government
agencies responsible for human health and IAQ issues specify HEPA filters for asbestos, lead and
mold abatement, TB and SARS isolation rooms and healthcare renovation projects.
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