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12
9
L
IFEBREATH
W
EATHER
H
OODS
Fixed covered weather hoods have a built-in bird screen with a 1/4 in. (6 mm) mesh to prevent
foreign objects from entering the ductwork.
Installation Notes:
•
The inner and outer liners of the flexible insulated duct must be clamped to the sleeve of the
weatherhoods (as close to the outside as possible) and the appropriate port on the HRV/ERV.
It is very important that the fresh air intake line be given special attention to make sure it is
well sealed. A good bead of high-quality caulking (preferably acoustical sealant) will seal the
inner flexible duct to both the HRV/ERV port and the weatherhood prior to clamping.
•
The flexible insulated duct that connects the two outside weatherhoods to the HRV/ERV
should be stretched tightly and be as short as possible to minimize air flow restrictions.
•
Twisting or folding the duct will severely restrict airflow.
•
Hard (rigid) ducting which has been sealed and insulated should be used for runs over 10 ft
(3.3 m). Refer to your local building code.
Installation Steps:
1.
Thermal collar slides over galvanized sleeve to ensure vapor barrier is 100% sealed to wall plate.
2.
Fasten thermal collar to belt.
3.
Slide the insulated flexible ducting over galvanized sleeve and fasten it to the thermal collar.
4.
Weatherhood is hinged to allow for easy access for cleaning of mesh screen.
Attention
•
Weather Hood Requirements:
Check local codes/authority having jurisdiction for acceptance
and space requirements for weatherhoods. Do not locate in garage, attic, or crawl space.
i)
Intake:
Should be located upstream (if there are prevailing winds) from the exhaust outlet.
Not near dryer vents, furnace exhaust, driveways, oil fill pipes, gas meters, or garbage
containers.
ii)
Exhaust:
Not near a gas meter, electric meter or a walkway where fog or ice could create a
hazard.
Figure Callouts:
(1)
Thermal Collar
(2)
12 in. long Galvanized Sleeve
(3)
Exterior Wall
(4)
1/4 in. (6mm) Mesh Screen