4
supply to system duct work, the metal duct should be
insulated (See Fig. 9). This can act as a silencer when
connecting ducts to return ---air duct system. This should
eliminate transmission of noise or vibration from unit to
main duct system.
Note: Balancing dampers should be installed in stale---air
exhaust and fresh air intake ducts before connecting to the
HRVBBSVU and HRVBBLVU units. The balancing dampers
are provided in the HRVBBLHA units (see balancing HRV
section). Make sure both balancing dampers are left in fully
open position before connecting the ducts to these ports. See
Integrated balancing damper illustration.
INSULATED DUCT CONNECTING
FRESH AIR & EXHAUST TO
OUTSIDE
NOTE: SUPPLY & EXHAUST DUCTS TO HAVE
BALANCING DAMPERS (ON COLD SIDES)
(SEE STEP 4-CONNECT DUCTS TO HRV)
A
FURNACE
6 IN.
6 IN.
REAR
INLET HOOD
6 FEET
EXHAUST HOOD
18 IN.
HRV
3 FT
NOTE: ALL DUCT WORK TO BE FIELD SUPPLIED.
GROUND LEVEL
B
NOTE: A + B = Not less than 10 feet
A05357
Fig. 8 --- Exhaust Ventilation
HRV
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