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Lifebreath Weatherhoods (Optional)
Fixed covered weatherhoods 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 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 ERV port and the weatherhood prior to clamping.
The flexible insulated duct that connects the two outside weatherhoods to the ERV should be
stretched tightly and be as short as possible to minimize airflow 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 building code.
1/4 in (6 mm)
Screen
Dual Hood Part 99-190
With the Lifebreath Dual Hood, only one 6 in hole is required in the exterior wall to complete two
connections: fresh air intake and stale air exhaust.
Attention/Caution
Contact your local building authority before installation of the Dual Hood to verify compliance with
local building codes.
Caution:
Weatherhood arrangement - requires a minimum of 6 ft (2 m) separation, a minimum of 18 in (460 mm) above the
ground, or above the depth of expected snow accumulation, and a minimum of 3 ft (1 m) from corner of building.
Screen
(side view)
Exterior wall
Collar is supplied to
ensure vapor barrier is
100% sealed to wall plate
12 in galvanized
pipe supplied
10
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