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6.5 Installing the Ductwork and Registers (cont’d)
6.0 Ductwork Installation (cont’d)
6.5.3 Simplified installation (Volume Ventilation) (as illustrated in Section 5.3)
There are two methods (figures 12 and 13) for connecting the unit to the furnace:
Method 1: return-supply Method 2: return-return
Stale air intake:
• Cut an opening into the furnace return duct (at least 6 feet (1.8 m) from the furnace).
• Connect this opening to the stale air intake port on the HRV/ERV as shown .
Fresh air distribution: (same instructions as for Method 1 or Method 2, Section 6.5.2).
For Method 2 (return-return) make sure there is a distance of at least 3 feet (0.9 m) between
the 2 connections to the furnace.
NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the
HRV/ERV operation, but we recommend it.
VD0042
A
B
VD0043
A
B
minimum 3’
(0.9 m)
A+B= not less
than 10’ (3.1 m)
minimum
18” (0.5 m)
figure 12
figure 13
A+B= not less
than 10’ (3.1 m)
CAUTION
If using Method 2, make sure the furnace blower operation is synchronized with the
HRV/ERV operation! See Section 8.4.
WARNING
When performing duct connection to the furnace, installation must be done in accordance with all
applicable code sand standards. Please refer to your local building code.
CAUTION
When performing connection to the furnace ducts (Method 1), these ducts must be sized to support
the additional airflow produced by the HRV/ERV. Also, the supply duct must be a steel duct with a
backdraft damper to prevent the risk of overheating the HRV/ERV.
Steel duct with
backdraft damper
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