Direct Air PHRV Handbuch für Installation, Betrieb und Wartung - Seite 6
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INSTALLING DUCTS GOING TO / FROM OUTSIDE
PRACTICAL
TIPS
• Decide where your intake and
exhaust hoods will be located.
Locating the Intake Weatherhood
• Should be located upstream (if there
are prevailing winds) from the exhaust
outlet
• At least 6' (2m) away from dryer vents
and furnace exhaust ( medium or high
efficiency furnaces)
• A minimum of at least 6' (2m) from
driveways, oil fill pipes, gas meters, or
garbage containers
• At least 18" (457mm) above the
ground, or above the depth of expected
snow accumulation
• At least 3' (1m) from the corner of the
building
• Do not locate in a garage, attic or
crawl space
Locating the Exhaust Weatherhood
• At least 18" (457mm) above ground or
above the depth of expected snow
accumulation
• At least 3' (1m) away from the corner
of the building
• Not near a gas meter, electric meter or
a walkway where fog or ice could create
a hazard
• Not into a garage, workshop or other
unheated space
When installing the weatherhood, it's
outside perimeter must be sealed with
exterior caulking.
6
A well designed and installed ducting system will allow the HRV to operate at its maximum efficiency. Always try to keep
duct runs as short and straight as possible.
See Installation Diagrams for installation examples.
INSTALLING THE DUCTING
TO THE WEATHERHOODS
The inner liner of the flexible insulated duct must be
clamped to the sleeve of the weatherhoods (as close to
the outside as possible) and to the appropriate port on
the HRV. The insulation should remain full and not be
compressed. The outer liner, which acts as a vapor bar-
rier must be completely sealed to outer wall and the
HRV using tape and or caulking. A good bead of high
quality caulking (preferably acoustical sealant) will seal
the inner flexible duct to both the HRV port and the
weatherhood prior to clamping.
To minimize air flow restriction, the flexible insulated duct
that connects the two outside weatherhoods to the HRV
should be stretched tightly and be as short as possible.
Twisting or folding the duct will severely restrict air flow.
1 Using the collar of the out-
side hood, outline the
intake & exhaust holes to
be cut. The holes should
be slightly larger than the
collar to allow for the
thickness of the insulated
flexible duct. Cut a hole
for both the intake and
exhaust hoods.
3 Push the hood into the
opening. Attach the hood to
the outside wall with
mounting screws. Repeat
the installation procedure
for both the Supply and
Exhaust hood.
Model
Description
RC4
4" Roof cap
UEV4
4" Soffit vent
HS4W
4" Louvered shutters
* Application for Supply or Exhaust
2 Pull the insulated flexible
duct through the opening
until it is well extended and
straight. Slide the duct's
inner vinyl sleeve over the
hood collar and secure, pull
the insulation over the duct
and then the vapor barrier
over the sleeve and secure
with duct tape.
4 Using a caulking gun,
seal around both
hoods to prevent any
leaks.