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• X, XM Type
When an External Air Intake Flange (ø100) is in Use
External Air Intake Volume and Resistance and
Operation Noise Characteristics within the Unit
100
90
80
70
60
50
40
30
20
10
0
0
External Air Intake Volume (m
• 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
1.5m 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.
• X, XM Type
The amount of external air that is possible to feed when it is fed directly into the unit (ø100)
For use with mini cassettes
Type
Permissible Air Intake
Volume (m
NOTE
The operation noise for models that use small units is lower, so use
values that are within the range shown in the above table. Using
values that exceed these will result in noise when only external air
is fed being louder than the noise emitted from the unit.
• US Type
The amount of external air that is possible to feed when
connected to round ducts (ø100).
Type
Permissible Air Intake
Volume (m
NOTE
Using values that exceed those shown in the above table will result
in noise when only external air is fed being louder than the noise
emitted from the indoor unit, so only use values that are within the
range of the above values.
50
40
30
Operation Noise
20
(External Air Intake Only)
5
10
15
18
20
3
/h)
12
16
13
15
3
/h)
12
16
108
126
3
/h)
With the External Air Intake Flange Attached
X Type
18
15
18
150
1-320
XM Type
Duct (ø100) for Connecting the
External Air Intake Flange
External Air Intake Volume and
Resistance within the Unit
Resistance within the Unit OFF
50
40
30
20
10
0
0
60
120
180
Permissible Air Intake Volume (m
With the External Air Intake Flange
Attached
Duct (ø100) for Connecting
the External Air Intake Flange
3
/h)
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