4.1
P
LANNING OF THE
D
UCTWORK
• Keep it simple. Plan for a minimum of bends and joints.
• Keep the length of insulated ducts to the outside of home to a minimum.(not for HEPA Filtration model GSFH1K).
• Do not ventilate crawl spaces or cold rooms.
• If the house has two floors or more, be sure to plan for at least one exhaust register on the highest lived-in level.
Use the table below to plan the flexible ducts length.
4. PLANNING THE INSTALLATION
(CONT’D)
- 8 -
Maximum
Maximum
recommended length recommended length
to reach 105 cfm to reach 95 cfm
Insulated fresh air duct
from outside (6” diameter)
up to 10’
from 10’ to 20’
Insulated exhaust air duct
to outside (6” diameter)
up to 10’
from 10’ to 20’
Recommended Recommended
maximum length maximum length
to reach 270 cfm to reach 240 cfm
Stale air duct from inside
(8” diameter)
Combined: 40’
Combined: 60’ with
Filtered air duct to inside
stale air duct not to
(8” diameter)
exceed 36’
FLEXIBLE DUCT LENGTH TABLE
5. TYPICAL INSTALLATIONS
Installations may vary according to the model number, the product orientation (vertical or horizontal) and the location in the home where
the unit is installed. Use the following illustrations as guidelines to help you decide the appropriate installation.
The unit allows for multi positional mounting (vertical or horizontal). It may be hung to the joists (preferred method), or it may be laid down
on one of three surfaces, and installed either vertically or horizontally.
NOTE: For more details, see Points 5.3 and 5.4 in Section 5 INSTALL THE UNIT.
In every case, bathroom fans and a range hood should be used as spot ventilation to exhaust stale air. Also, for homes with more than
one level, we recommend placing one exhaust register at the highest lived-in level.
There are three installation methods: Stand Alone, Central Draw Point* and Return-to-Return*.
* Different connections to a forced air system.
Multiple furnaces or air handlers may require installation of Broan Fresh Air Systems on each system for maximum IAQ benefit.
NOTE: A grounded three-prong electrical outlet has to be available within 3 feet from the unit.
WARNING
Do not attempt to recover in any ways the exhaust air from a dryer or a range hood. This would cause clogging of the filters
and recovery module (if applicable); this is also a fire hazard. Not following this warning will void the warranty.
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