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• U1 Type
When an External Air Intake Flange (ø100) is in Use
External Air Intake Volume and Resistance and
Operation Noise Characteristics within the Unit
• Calculate the operation noise when external air is being fed by combining the noise when only external air
is being fed as shown in the graph for operation noise characteristics and the operation noise of the unit as
stipulated in the catalogue.
• The operation noise conforms to JIS standards and constitute measurements taken in an anechoic chamber
1.5 m directly beneath the indoor unit. Under normal circumstances, the values shown here are greater owing
to the effects of surrounding noise and reverberation when the unit is actually installed.
With the External Air Intake Flange Attached
Resistance within the Unit (Pa)
External Air Intake Volume (m
3
/h)
Noise with only External
Air Intake dB(A)
Operation Noise
(External Air Intake Only)
Duct (ø100) for Connecting
the External Air Intake Flange
U1 Type
0
0
10
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100
5
10
15 2018
Sec1.indb36Sec1.indb36 2012/03/0717:29:592012/03/0717:29:59
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