HEPA FILTERS
What is HEPA?
HEPA (High Efficiency Particulate Air) is a filtration
standard created by the U.S. Atomic Energy Commision. HEPA filter media
is proven to be 99.97% efficient @ 0.3 microns and 95% efficient @ 0.1
microns. Due to their extremely high efficiency, HEPA filters have
become widely used in medical, electronic and industrial applications.
HEPA filters are composed of a various sized borosilicate fibers, which
are pressed together to form a net-like structure with openings large
enough for air to pass through but too small for most particulates.
Measuring in microns
Airborne particulates are measured in microns. One
micron is equal to one-millionth of a meter or 1/25,000th of an
inch.
Three-Stage Filtration Process
The Americaire® Air Filtration Systems employ a
three-stage filtration process for maximum effectiveness, filter life
and efficiency.
Stage 1: The first stage employs a prefilter. This
prefilter removes large particulates that otherwise would shorten the
life of the HEPA filter. >> Dander,
dust, lint and fibers.
Stage 2: The second stage employs a HEPA filter for removal of 99.97% of
all particulates from 0.3 microns in size. >>
Attached viruses, bacteria, molds, pollen, radon daughters and smoke.
Stage 3: The third and final stage uses a carbon filter dedicated to V.O.C. removal. >>
Gases, fumes and odours.
How a typical HEPA system works
Example of the Americaire® 4000HV operating on a
by-pass system. A portion of the home's return air is routed through the
air filtration system before it reaches the furnace or air handling
system. This rerouted air is cleaned and fed back into the home's air
supply via the furnace. By continuously cleaning the air, significant
reduction in pollution results.
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