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Weatherhood Installation
Installing the Ducting from the
Weatherhoods to the HRV/ERV
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.
To minimize air flow restriction, the flexible insulated duct that
connects the two outside weatherhoods to the HRV/ERV should
be stretched tightly and be as short as possible.
Twisting or folding the duct will severely restrict air flow.
Hard (rigid) ducting which has been sealed and insulated should be
used for runs over 10’ (3.3 m). Refer to your building code.
Intake Weatherhood Requirements
• Should be located upstream (if there are prevailing winds)
from the exhaust outlet
• At least 6' (2 m) from the exhaust weatherhood
• At least 6' (2 m) away from dryer vents and furnace exhaust
(medium or high efficiency furnaces)
• A minimum of at least 6' (2 m) from driveways, oil fill pipes,
gas meters, or garbage containers
• At least 18" (460 mm) above the ground, or above the depth
of expected snow accumulation
• At least 3' (1 m) from the corner of the building
• Do not locate in a garage, attic or crawl space
Exhaust Weatherhood Requirements
• At least 6' (2 m) from the ventilation air intake
• At least 18" (460 mm) above ground or above the depth of
expected snow accumulation
• At least 3' (1 m) 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, its outside perimeter must be
sealed with exterior caulking.
Weatherhoods
Fixed covered weatherhoods have a built-in bird screen with a 1/4"
(6mm) mesh to prevent foreign objects from entering the
ductwork.
5” (125 mm) Part No.WH 185
6” (150 mm) Part No.WH 186
Weatherhood Installation
1. Thermal Collar slides over galvanized
sleeve of Weatherhood.
2. Fasten Thermal Collar to Belt.
3. Slide the Insulated Flexible Ducting over
theWeatherhood's galvanized sleeve and
fasten it to the Thermal Collar.
4. Hood is hinged to allow for easy access
for cleaning of bird screen.
W
TI 15
0
1/4" (6 mm) SCREEN
(front view)
EXTERIOR
WALL
SCREEN
(side view)
C
OLLAR IS SUPPLIED TO
ENSUREVAPOUR BARRIER
IS 100% SEALED TO
WALL PLATE
12" galvanized
pipe supplied
36" (1m)
recommended min.
36" (1m)
recommended min.
6' (2m)
recommended min.
18" (460mm) min.
18" (460mm) min.
OUTSIDE CORNER
INTAKE
EXHAUST
INSIDE CORNER
CAUTION
Weatherhood arrangement - requires a minimum of
6' (2m) separation and a minimum of 18" (460mm)
above the ground, or above the depth of expected
snow accumulation.
ATTENTION
Local codes may require greater distances for
exhaust and intake.