LG MULTI F Series Engineering Manual page 349

F
MULTI
F
MULTI MAX
Method 2: Unconditioned Outdoor Air (Non-Ducted, Fan Assisted Ventilation)
When approved by local codes, the fan assisted ventilation method uses exhaust fans to remove air from the building, and outdoor air is
drawn into occupied spaces through a wall louver or gravity roof intake hood. Supply fans can also be used to push the outdoor air into the
space and building positive pressure will vent the exhaust air through louvers or roof-mounted exhaust hoods. Outdoor air is neither cooled
nor heated before entering the building.
This may result in loss of building pressurization control, increasing infiltration loads with adverse effects.
Advantages
• Outdoor air may be manually controlled by the occupant or auto-
matic controls may be installed to open/close outdoor air dampers
or to turn on/off ventilation fans.
• Useful for large open spaces like warehouses, garages, and
workshops.
• Outdoor air volume is a known quantity. Air loads may be easier to
calculate since fans will regulate the amount of outdoor air.
• May be used with the full lineup of Multi F indoor units.
Figure 40: Unconditioned Outdoor Air (Non-Ducted, Fan Assisted Ventilation).
OA Wall
Louver
BUILDING VENTILATION DESIGN GUIDE
Damper
Due to our policy of continuous product innovation, some specifications may change without notification.
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Disadvantages
• In some locations of the country, it may be difficult to control
humidity levels.
• Indoor units may have to be oversized to account for the added
heating/cooling loads when louvers/hoods are open.
• Hot, cold, and/or humid areas may be present if the outdoor air is
not evenly distributed to the different spaces.
Roof Fan
APPLICATION GUIDELINES | 349