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Indir
ect Duct System
This method of installation per
mits localized exhaust of indoor air and uses the
existing forced air system to distribute fresh air. This system will therefore per-
mit independent room balancing of exhaust stale air, however the distribution
of fresh supply air cannot be balanced.
In this system, the fresh air supply can either be directly connected through a
ceiling return air plenum into an air handler or directly into the return air duct
into the air handler. Once through the air handler, the air then moves into the
fresh air supply duct run.
Please see fig. below.
Simplif
ied Duct System
This system is primaril
y used when it is impractical to install dedicated duct
runs from the HRV to various room of the building. In this installation the
warm air exhaust from the building to the HRV and fresh air supply from the
HRV to the building are connected to the existing force air duct system. This
installation has the exhaust stale air may drawn directly from the return air
duct.
When this system is used, the air handlers’ blower will need to operate con-
stantly when ventilation is required. The exhaust take-off connection must be at
least 1 meter (3.28 ft) away from a directly connected HRV supply duct if both
are connected to the same run.
Please see fig. below.
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2500DD-Install-ENG 1/17/06 5:56 PM Page 13
Summary of Contents for SHRV2500DD
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