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010.1220.0719 01.21
3.5 Connection To Duct
The ventilator can be connected to a duct. To acheive
maximum performance with minimal energy consumption,
the ventilator should be connected to the duct system with
the specied lengths of duct before and after the ventilator.
NOTE: The distance “3 x D” is not a requirement. It is a
recommendation that will help achieve maximum performance with
minimal energy consumption
3.6 Connection To Flexible Duct
Flexible duct sections can be used to reduce vibrations in the
duct system. If used, the FLF should be connected between
the fan inlet/outlet and the main duct as shown in Fig 8.
This will decrease system vibration and prevent fan housing
deection.
NOTE: The distance “3 x D” is not a requirement. It is a
recommendation that will help achieve maximum performance with
minimal energy consumption
3.7 Outdoor Termination
The BEFx box ventilator is suitable for outdoor installations. It
can mount directly to the roof or on a roof curb as shown in
Fig. 9 and Fig. 10. When the ventilator is used at an exhaust
termination point, local codes may require a gooseneck to
be installed at the outlet, preventing rain entering into the
ventilator. See Fig. 9.
Fig 8
Fig 7
Fig 9
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