Air duct design & noise reduction
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Table 3: Maximum air delivery speed of diffuser (m/s)
Net indoor height /m
Building
Permitted noise
/dB (A)
3 4 5 6
7
Broadcasting 32
3.9
4.2
4.3
4.4 4.5
Theatre, residence, operation room
33
—
39
4.4 4.6 4.8 5.0 5.2
Hotel, personal office
40
—
46
5.2 5.4 5.7 5.9 6.1
Shop, bank, restaurant, department store
47
—
53
6.2 6.6 7.0 7.2 7.4
Public building; office, department store
bottom floor
54
—
60
7.4 7.9 8.3 8.7 8.9
Table 4: Max. air delivery speed at orifice, strip seam and spout (m/s)
Air port
Max air delivery
speed
Remark
Orifice 3
—
5
Seam port
2
—
4
Spout 4
—
10
Upper limit is preferred for high even delivery requirement
or hot air, for high installed position of port, or higher air
speed is allowed in area of personnel activities.
Table 5: Air suction speed at return air port (m/s)
Position of return air port
Air suction speed
Room upper part
4
—
5
Room lower part
Near points of stay of personnel
1.5
—
2
Table 6: Recommended criteria for indoor noise control (referencing “High building air
conditioning design” published by China Architectural Industry Publishing House).
Type of room
Noise level
Guest room
Grade I
Grade II
Grade III
Grade IV
30
35
40
55
Restaurant
Banquet hall
Multifunction hall
Grade I
Grade II
Grade III
Grade IV
（
35
）
40
45
55
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