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6.5.2 Exhaust Ducted System (Source Point Ventilation) (as illustrated in Section 5.2)
Stale air exhaust ductwork: (same as for Fully Ducted System, described on page 15)
Fresh air distribution:
There are two methods for connecting the unit to the furnace:
Method 1: supply side connection
• Cut an opening into the furnace supply duct at least
18 inches (0.5 m) from the furnace.
• Connect this opening to the fresh air distribution port
of the HRV/ERV (use steel duct, see figure 10).
• Make sure that the HRV/ERV duct forms an elbow
inside the furnace ductwork.
• If desired, interlock (synchronize) the furnace blower
operation with the HRV/ERV operation.
(See Section 8.4).
Method 2: return side connection
• Cut an opening into the furnace return duct not less than
10 feet (3.1 m) from the furnace (A+B).
• Connect this opening to the fresh air distribution port of
the HRV/ERV (see figure 11).
NOTE: For Method 2, it is not essential that the furnace
blower runs when the HRV/ERV is in operation,
but we recommend it. If desired, synchronize the
furnace blower operation (see Section 8.4).
16
6.0 Installation (cont’d)
6.5 Installing the Ductwork and Registers (cont’d)
VD0040
B
A
VD0041
minimum
18” (0.5 m)
Steel duct with
backdraft damper
A+B= not less
than 10’ (3.1 m)
figure 10
figure 11
WARNING
010
!
When performing duct connection to the furnace, installation must be done in accordance with all
applicable codes and standards. Please refer to your local building code.
CAUTION
When performing connection to the furnace supply duct, this duct must be sized to support the
additional airflow produced by the HRV/ERV. Also, use a steel duct with a backdraft damper to pre-
vent the risk of overheating the HRV/ERV.