Planning Of The Ductwork; Typical Installations - NuTone GSEH3K Installation Instructions Manual

4. PLANNING THE INSTALLATION
4.1 P
LANNING OF THE
• 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.
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.

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.
(CONT'D)
D
UCTWORK
FLEXIBLE DUCT LENGTH TABLE
Insulated fresh air duct
from outside (6" diameter)
Insulated exhaust air duct
to outside (6" diameter)
Stale air duct from inside
(8" diameter)
Filtered air duct to inside
(8" diameter)
Maximum
recommended length recommended length
to reach 105 cfm
up to 10'
up to 10'
Recommended
maximum length
to reach 270 cfm
Combined: 40'
WARNING
!
0
- 8 -
Maximum
to reach 95 cfm
from 10' to 20'
from 10' to 20'
Recommended
maximum length
to reach 240 cfm
Combined: 60' with
stale air duct not to
exceed 36'