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Specification Guide

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48 | DUCTED
Ceiling-Concealed Ducted System Engineering Manual
ASHRAE Standards 62.1 and 62.2 (depending on if the building is residential or commercial), and local codes specify the minimum volume
of airflow that must be provided to an occupied space. Outdoor air is required to minimize adverse health effects, and it provides acceptable
indoor air quality for building occupants while helping reduce the effects of off-gassing from certain building materials that may contribute
to the corrosion of indoor units. Indoor units located within the zone typically require less airflow to condition the space. During the design
phase, refer to the airflow capabilities listed in the specification tables for each product. Choose the best method for the application out of the
five (5) ventilation options available.
Disclaimer
Although we believe that these building ventilation methods have been portrayed accurately, none of the methods have been tested, veried, or
evaluated by LG Electronics, U.S.A., Inc., In all cases, the designer, installer, and contractor should understand if the suggested method is used,
it is used at their own risk. LG Electronics U.S.A., Inc., takes no responsibility and offers no warranty, expressed or implied, of merchantability
or tness of purpose if this method fails to perform as stated or intended.
• For a complete copy of ASHRAE Standard 62.1 and 62.2, refer to the American Standard of Heating and Air Conditioning Engineers
(ASHRAE) website at www.ashrae.org.
Method 1: Natural Ventilation (Non-Ducted, Unconditioned Outdoor Air)
Natural ventilation devices, such as operable windows or louvers may be used to ventilate the building when local code permits. The open
area of a window or the free area of a louver must meet the minimum percentage of the net occupied floor area.
Advantages
• Occupants control the volume of the ventilation air manually.
• Useful for historic buildings that have no ceiling space available for
outdoor air ductwork.
• May be used with the full lineup of Duct-Free Split system indoor
units.
Disadvantages
• In some locations, it may be difficult to control humidity levels when
windows are open.
• Thermal comfort levels may be substandard when windows are
open.
• Indoor units may have to be oversized to account for the added
heating and cooling loads when windows are open.
• Provides outdoor air to perimeter spaces only. Additional mechan-
ical ventilation system may be required to satisfy requirements for
interior spaces.
• Outdoor air loads may be difficult to calculate since the quantity of
outdoor air is not regulated.
• May affect indoor unit proper operation when open.
Figure 24: Natural Ventilation (Non-Ducted, Unconditioned Outdoor Air).
BUILDING VENTILATION DESIGN GUIDE
Methodology illustrations are for examples only and do not depict actual
indoor units for the specic outdoor unit pairing. These are generic illus-
trations to show ventilation design only.