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DUCTING OUTSIDE
OUTSIDE WEATHERHOODS
The Outside
Weatherhoods required for operation of the SHRV2500 HRV are to
be provided by the installing contractor. Weatherhoods must have built in bird
screens to prevent birds and rodents from entering the premise through the
ductwork. When designing and locating the fresh air intake, consideration
should be given to the best place where the hoods will gather the freshest air,
free from restriction.
We recommend:
• No less than 10 ft. (3 m) apart from each other.
• At least 18 in. (46 cm) above ground level or potential snow accumulation.
• Away from sources of contaminates, such as automobile exhaust fumes,
gas meters, garbage containers, cooling towers, etc.
• Not exposed to prevailing winds, wherever reasonably possible.
The outside perimeter of the weatherhoods must be caulked to prevent leakage
into the building. Roof vents must have adequate curb height for water protection
and to be sealed to the ducting.The design and size of the weatherhoods or
louvers chosen by the installer, must allow for adequate free area. Water and
snow penetration of the system is minimized when the airflow does not exceed
750 fpm (3.81 m/s) free area velocity.
WEA
THERHOOD DUCTING
Galv
anized metal ducting with sufficient cross section and with an integral
single piece vapor barrier should be used to connect to the HRV to the weather-
hoods. All ducting must meet ULC Class 1 Fire Rating and the minimum R-
value of the insulation should be equal to 4 (RSI 0.75), or as stated in local
codes.
All ducting must be well sealed to prevent air leaks and a sufficient bead of
high quality caulking (preferably acoustical sealant) and taping with a high
quality aluminum foil tape is recommended to seal the duct to both the HRV
and the weatherhoods.
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2500DD-Install-ENG 1/17/06 5:56 PM Page 10
Summary of Contents for SHRV2500DD
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