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5.3 PLANNING OF THE DUCTWORK
All units in this manual are prebalanced.
• Keep it simple. Plan for a minimum of bends and joints.
• Keep the length of outside insulated duct to a minimum.
• Do not ventilate crawl spaces or cold rooms. Do not attempt to recover the exhaust air from a dryer or a range hood. This would
cause clogging of the filters and recovery module.
• If the house has two floors or more, be sure to plan for at least one exhaust register on the highest lived-in level.
5.4 INSTALLINGNON-INSULATED DUCTS AND REGISTERS
5.4.1 STAND ALONE SYSTEM (AS ILLUSTRATED IN SECTION 1.1.1)
Stale air exhaust ductwork
• Install the stale air exhaust register in the main area where the contaminants are produced: kitchen, living room, etc. Position the
register as far from the stairway as possibleand in such a way that the air circulates in all the lived-in spaces in the house. If desired,
you can install another register (sold separately).
• If the register is installed in the kitchen, it must be located at least 4 feet (1.2 m) from the range.
• Install the register 6 to 12 inches (152 to 305 mm) from the ceiling on an interior wall OR install it in the ceiling.
Fresh / Filtered air distribution ductwork
• Install the fresh / filtered air distribution register in a large, open area in the lowest level to ensure the greatest possible air circulation.
Keep in mind that the filtered air register must be located as far as possible from the stale air register. If desired, you can install
another register (sold separately).
• Install the register in the ceiling OR 6 to 12 inches (152 to 305 mm) from the ceiling on an interior wall. The duct lenght should be
at least 15’ (4.6 m). (The filtered air will then flow through the room and mix with room air, ensuring a continuous renewed airflow.)
HEPA 3100, HF 3.1 ANDHEPA 4100 UNITS ONLY
How to connect the 8’’ flexible duct to the registers
• Once the register location is determined, cut out a 10 ¼’’ x 6 7/8’’ (260 mm x 175 mm)
hole. Run one end of the 8’’ flexible duct through the hole and fix it to the duct
connector (1), using a tie wrap and duct tape. Fix the duct connector to the wall (or ceiling)
using its 4 plastic anchors and 4 #8 x 3/4” screws. Then, snap on the register (2).
See illustration beside.
HRV 2600 ANDHR 2.6 UNITS ONLY
How to connect the 6’’ flexible duct to the diffusers
• Once the diffuser location is determined, cut out6’’ (155 mm) diameter hole.
Run one end of the 6’’ flexible duct through the hole and fix it to the
diffuser base (1), using a tie wrap and duct tape. Fix the diffuser base to the
wall (or ceiling) using its 4 #8 x 3/4” screws. Then, slide in the diffuser (2).
See illustration beside.
WARNING
Never install a stale air exhaust register in a closed room where a combustion device operates, such as a gas furnace, a gas
water heater or a fireplace.
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5. INSTALL THE UNIT (CONT’D)
VD0078
1
2
Ø 6''
(155 mm)
VD0158
1
2