Media Filters
Media filters strain particulates from the air. The filter
media needs to have tiny holes to allow air to pass
through, but not particulates. Filter types vary for all
sorts of purposes. The most effective and proven filter
media is HEPA. HEPA filter media is 99.97% efficient
at capturing particles which are 0.3 micron in size or
larger.
Inner Charcoal Filter/Carbon Canister
Carbon media is used to capture chemicals and odors,
also referred to as V.O.C.’s. Chemicals and odors
cannot be captured with media type filters. Activated
carbon attracts chemicals and odors and holds them.
If air passes through the carbon filter before particu-
lates are removed, the surface of the carbon quickly
gets covered with particulates, rendering it ineffec-
tive at capturing chemicals and odors. If particulates
are removed from the air with a HEPA filter, virtually
the entire surface area of the carbon can be used to
capture chemicals and odors. This increases the effi-
ciency and filter life of the inner charcoal filter.
Separate HEPA and Carbon Filters
HEPA and carbon filters have different life spans. It is
important for a filtration system to keep the filter com-
ponents independent from each other, so that the filter
that is dirty/saturated can be changed. This is more
economical than a system where you need to throw
out two or three filters when only one needs changing.
The HEPA System’s 3 Stage Filtration Process
The 3 stage filtration process is used to create a very
effective filtration system. Each filter is independent
and can be changed individually.
• Stage 1:
Carbon pre-filter - The inexpensive carbon
pre-filter removes larger particulates from the air, thus
prolonging the life of the HEPA filter.
• Stage 2:
HEPA - The HEPA filter removes 99.97%
of particulates 0.3 micron and larger. The cleaned air
then passes through the third stage filter.
• Stage 3:
Inner Charcoal Filter - The inner charcoal
filter is 1/2 an inch thick to give it plenty of surface
area for removing chemicals and odors from the air.
OPTIONAL UPGRADE:
The stage 3 Inner Carbon
Filter may be replaced by an optional heavy duty
granulated coconut shell carbon canister. The VOC
Canister offers increased capacity removal of chemi-
cals and odors. Filled with granulated coconut shell
carbon, the surface area available for adsorption of
gas and chemical pollution is approximately
60 to
70 million square feet
. The filter upgrade captures
many contaminents in the air and holds them safely in
the carbon. The increased capacity of this filter also
extends the performance life. The VOC Canister also
captures low level
ozone
from outside air and uses
the ozone to turn the filter into an active system which
actually destroys VOCs rather than just holding them.
3
General Information
Product Application Guidelines
Size of House vs. Air Changes per Hour
* Chart based on homes with 8 ft. ceilings.
Notes:
• Industry experience indicates that one (1) air change per hour generally provides adequate air cleaning. Actual
results will depend on multiple factors such as outdoor particulate levels, infiltration rate, indoor activities etc.
• The chart is based on an infiltration rate of 0.3 air changes per hour, which is typical for residential construction.
Higher infiltration typically brings in more particulates and thus increases the air changes per hour needed for
HEPA bypass filtration. Other particulate sources in the house will require higher air changes per hour.
• The chart is based on continuous operation of the HEPA system. If the HEPA system is cycled, the capacity
of the filter needs to be increased. For example, if the HEPA system is “ON” only half the time, then the capac
ity of the unit needs be doubled or additional units need to be installed.
• The more air changes per hour provided, the more effective a HEPA system will be. People with sensitivities
may desire a higher number of air changes per hour for cleaner air.
Size of House*
Model
1,000 ft
2
1,200 ft
2
1,500 ft
2
1,800 ft
2
2,000 ft
2
2,500 ft
2
3,000 ft
2
3,500 ft
2
Unit
(8,000 ft
3
) (9,600 ft
3
) (12,00 ft
3
) (14,400 ft
3
) (16,000 ft
3
) (20,000 ft
3
) (24,000 ft
3
) (28,000 ft
3
)
HEPA-20
1.35
1.13
0.9
--
--
--
--
--
HEPA-40
2.4
2.0
1.6
1.3
1.2
1.0
--
--
HEPA-60
3.8
3.1
2.5
2.1
1.9
1.5
1.3
1.1
