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F-Barometric Relief Dampers
Dampers are used in downflow (see figure 20) and horizon
tal (see figure 21) air discharge applications. Horizontal
barometric relief dampers are installed in the return air
duct. The dampers must be used any time an economizer
and a power exhaust fan is applied to LHT series units.
Barometric relief dampers allow exhaust air to be dis
charged from the system when an economizer and/or pow
er exhaust is operating. Barometric relief dampers also
prevent outdoor air infiltration during unit off cycle. See in
stallation instructions for more detail.
NOTE- Barometric relief damper is optional except re
quired with power exhaust dampers.
G-Power Exhaust Fan
The power exhaust fan (K1PWRE10B) requires an option
al gravity exhaust damper and economizer and is used in
downflow applications only. See figure 22. The power ex
haust fan provides exhaust air pressure relief and also runs
when return air dampers are closed and the supply air
blower is operating. See installation instructions for more
detail.
FIGURE 20
BAROMETRIC RELIEF DAMPERS - DOWNFLOW
DAMPER
ASSEMBLY
HOOD TOP
HOOD TOP
SUPPORT
FIGURE 21
BAROMETRIC RELIEF DAMPERS - HORIZONTAL
13
(330)
29-1/2
(749)
RETURN AIR PLENUM
6-1/2
(165)
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