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Appendix
7. Appendix
7.1
Operating Noise of Indoor Units
7.1.1 Difference between Catalogue Data and Actual Noise
Operating noise differs depending on the place of measurement (room) because of the various
degrees with which the room reverberates the sound. To determine the amount of reverberation
under uniform conditions, the unit has been measured in a dead room with results having been
compiled in the below table. The actual sound produced in unit operation can be determined
from Table 1.
Sound pressure rise due to room reverberation (Higher than catalogue data)
Table 1
Room Interior
Detection
Average Absorbed Sound (Room with
Approx. 50 m² Floor Area)
Estimated value to be added to
catalogue value
Classifications of indoor unit environments (reference data)
Table 2
Classification
1
Non-active places requiring silence
Sedate business activities that do not
2
disturb people even over time
Somewhat quiet settings that permit
3
soft-spoken conversation, typical
activities
Somewhat loud settings that permit
4
regular conversation, brisk activity
Loud places that permit conversation
5
in a loud voice, highly active place
with many people
6
Rather loud settings
Notes:
1. Excluding bedrooms
2. Reference values of faint noises in the place of usage
128
Floor
Walls
Ceiling
Environment
Reception rooms, libraries, sitting rooms,
hospitals (examining rooms) (NOTE 1)
Quiet offices, classrooms, small
conference rooms, lobbies
Small offices, large conferences rooms,
quiet stores, restaurants
Large offices, typical stores, cafeterias
Loud large-side offices, large cafeterias,
loud stores
Factories, gymnasiums, recreational
places like pachinko parlors
Floor area (m²)
A
Mortar
Linoleum tile
Mortar
Plaster
Mortar
mineral wool tile
0.05
Typical office
11~12
8~8.5
Faint Noises
Example
(NOTE 2)
SiEN34-705
B
C
Carpet
Fiberglass +
Saroncross finish
Fiberglass +
Saroncross finish
0.12
0.25
5~6
Recommended
Operating Noise on Site
~35
~40
~40
~45
~45
~50
~50
~55
~55
~60
~60
~65
General Information
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