About the PuriFresh® Heat Recovery Ventilator and HEPA Filter
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Product
Specifications: |
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Ventilation
Rate |
40 CFM (Cubic Feet per
Minute) |
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Size and Weight |
16” x 13” x 7 ˝ ”,
approximately 28 pounds. |
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HEPA Heat Filters |
True HEPA medium filters
99.97% of 0.3 micron particles. Also
act as heat exchangers. Replaceable yearly or as
needed. |
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Power |
80 Watts (max.) |
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Maximum Area Ventilated |
850 square feet (Assuming
8 foot ceiling height.) |
How It Works
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Each unit has
two blowers. One exhausts stale air from the room to the outside and the other
draws fresh air into the room from outside. Each unit also has four "HEPA Heat Filters" which
are identical to conventional HEPA filters in material and fabrication. These
are located directly under the exterior cover. The stale air is forced
through a "rotating air switch", then through two HEPA Heat Filters
before leaving the unit to the outside. The position of the air switch
determines which two HEPA Heat Filters have stale air flow. The fresh air is
drawn in through the remaining two HEPA Heat Filters, then through the
rotating air switch before going through the blower and entering the room. |
Viewing any one
of the four HEPA Heat Filters in time, stale air flows out, followed by fresh
air in, and so on, as the rotating air switch turns. This
"breathing" action, caused by the rotating air switch, causes the
HEPA Heat Filter to act as a heat and moisture exchanger. In winter, the warm
moist stale air deposits heat and moisture on the HEPA Heat Filter. When the
flow reverses and cold dry fresh air passes through it, the heat and moisture
is transferred to the fresh air. In summer, the same principle works to keep
heat and moisture out of the room. |
The image below shows an actual PuriFresh® HEPA Filter HRV with its metal cover replaced with a clear plastic one.
Click below to see movies of it running:
(The second movie has a “spider” place on the unit to visualize the reciprocating airflow.)
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