- How does the PuriFresh® HEPA-Filtered HRV mount in a
window?
The PuriFresh® HEPA-Filtered HRV is a Window Mounted Heat
Recovery Ventilator. The
PuriFresh® HEPA-Filtered Window Mounted HRV mounts in a
double hung window much like a window mounted air-conditioner, however,
it is much lighter and smaller that the typical window mounted
air-conditioner. Unlike the typical window mounted air-conditioner, the
PuriFresh® HEPA-Filtered Window Mounted HRV does not have
expandable side panels to fit any width window. Instead, two corrugated
plastic sheets are provided which are cut to the appropriate width to
fit the specific widow. This provides better insulation in winter as
well as a better air seal.
- Is a brace needed for window installation?
No brace is needed. If you have double hung windows in
your home, the PuriFresh® HEPA-Filtered HRV is a truly
economical, easy, do-it-yourself way to provide high quality HEPA
Filtered Heat Recovery Ventilation to your home!
- Can the PuriFresh® HEPA-Filtered HRV be mounted
through a wall?
Yes! View the manual for more details.
- The fresh air blows straight out of the unit. Can I change its direction?
Plastic deflectors, which
attach magnetically to the PuriFresh® HEPA-Filtered HRV are
available at many hardware stores.
These are manufactured for use on the air registers in homes with
force air heating or AC systems.
If you are having difficulty obtaining these, let us know, and we
will be happy to send you one at a reasonable price.
- What is true HEPA filtration?
In true HEPA filtration, 99.97% of all particles 0.3 microns in size are
removed from the air. This is verified by tests using a standard 0.3
micron DOP smoke.
- What level of HEPA filtration is achieved by PuriFresh®?
The medium (the fiberglass "paper") in the PuriFresh®
filters is a true HEPA medium. This medium is pleated and glued into a
chipboard box. The glue acts as a seal to prevent any air from
circumventing the medium, forcing it all to go through the medium. At
our current level of limited production, we cannot guarantee that these
glue seals are all perfect. We
have been assured by the filter manufacturer, that the filter, as a
unit, will pass a 95% 0.3 micron particle test. That is, the filter, as
a unit, will remove at least 95% of all 0.3 micron particles from the
air.
- How are the HEPA filters replaced?
The HEPA Heat filters are replaced once a year by removing the PuriFresh®
unit from the widow. Two screws holding the rear cover are removed. The
old filters are slipped out and the new ones put in their place. The
rear cover is replaced and the unit is returned to the window. This is
an excellent time to clean the window and the outside of the PuriFresh®
unit.
- Do the HEPA filters need cleaning between replacement?
No! The reciprocating flow of air helps prevent the buildup of large
dust particles. The filters are largely self-cleaning. Micron sized
particles are trapped in the filters and reduce flow with time. Since
only about 1% of the total mass of dust in the air is in this size
range, it is easy to see why it will take many-many times longer for the
PuriFresh® filters to clog compared to a console HEPA filter
in which the flow is in one direction and all the dust collects on one
side.
- What is the HEPA filter medium made of?
The filter medium is a microscopic fiberglass mat. While it looks like
paper, it is not a wood product. It is not damaged by
moisture.
- Why not just buy a cheaper console HEPA filter and keep the door
and widows closed to my room?
If you do that, the room will not receive required ventilation. The
American Lung Association (ALA), the Environmental Protection Agency
(EPA) and the American Society of Heating Refrigeration and
Air-conditioning Engineers (ASHRAE) all recommend ventilation to improve
indoor air quality (IAQ). Only PuriFresh® provides HEPA
filtered fresh air year round in a compact easy to install
window mounted unit!
- Why not just buy a cheaper console HEPA filter and keep a widow
open a bit?
This will provide fresh air. The fresh air, in addition to being cold in
winter and hot and humid is summer, will enter loaded with particles which
will disburse throughout the room before they enter the console HEPA
filter. The console HEPA filter will have to clean out these particles
after they have entered. Since these particles are continually entering,
the air can never be completely cleaned. PuriFresh® cleans
the particles out of the fresh air before it enters the
room. Only PuriFresh® provides HEPA filtered fresh air
directly to the room, year round.
- Why do I need ventilation?
Air pollution from volatile compounds is much higher indoors. These
volatile compounds include radon gas, formaldehyde, solvents from
cleaning supplies and beauty supplies, organic compounds emitted by
carpets, furniture, paint, insulation, linoleum, vinyl, electronic
equipment, etc.
- Why do I need filtration?
Unlike volatile air pollution, which is much higher indoors, particulate
concentrations are much higher outdoors. Hence, scrubbing virtually all
particles from the outside air, which PuriFresh® does, is
very important for healthy indoor air, especially for allergy and asthma
suffers.
- I live where there are air pollution alerts. Should I still ventilate?
Yes, but turn off ventilation
when there is a high pollution
alert and they recommend that you stay indoors. If pollution peaks at certain hours
of the day, put the unit on a timer so that it is off for those
hours. That will actually reduce
levels of outside pollutants in your home compared to no
ventilation. Fight for clean
air! Remember, all inside air
ultimately comes from outdoors.
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