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Sonic Series acoustic louvre SL4-30C

The Sonic Series acoustic louvre SL4-30C is a 300mm deep acoustic louvre designed to provide controlled airborne sound reduction while maintaining airflow performance. Use it where greater acoustic attenuation is required within a 300mm system depth.

Engineered to balance acoustic attenuation, airflow performance and weather protection, the SL4-30C uses a chevron blade arrangement to achieve higher airborne sound reduction within a 300mm depth. The configuration provides greater acoustic attenuation than the SL4-30 single-blade equivalent while maintaining practical airflow performance.

Product Properties Test Data Technical Information

  • Product name:

    AcousTech Sonic Series acoustic louvre SL4-30C

  • Weighted Sound Reduction Index (Rw):

    Rw 31 (C −1, Ctr −5) determined in accordance with AS/NZS ISO 717.1:2004

  • Insertion loss:

    25dB

  • Free open area (FOA):

    35%

  • Effective flow area (EFA):

    0.18m² (1000 × 1000mm reference specimen)

  • Discharge coefficient (Cd):

    0.53

  • Airflow classification:

    Class 2 (AS/NZS 4740:2000)

  • Rain penetration class:

    Class C (overall) / Class A (0 m/s)

  • Fire rating:

    Non-combustible

  • Test standards:

    AS/NZS ISO 717.1:2004 | AS/NZS 4740:2000

  • Typical test specimen:

    1000 × 1000mm

  • Customisation:

    Available in standard module sizes or engineered to project-specific dimensions.

Noise reduction
Frequency
(Hz)-1/3
Octave		 Noise Reduction
1/3 Octave 1/1 Octave
100 11 12
125 12
160 14
200 25 26
250 27
315 28
400 29 29
500 29
630 30
800 31 31
1000 31
1250 32
1600 33 33
2000 33
2500 33
3150 33 32
4000 32
5000 31
Pressure drop
Face Velocity
(m/s)		 Throat Velocity
(m/s)		 Pressure Drop (Pa) Cd (-)
0.5 1.7 6.5 0.53
1 3.5 25 0.54
1.5 5.2 57 0.53
2 6.9 100 0.54
2.5 8.7 160 0.53
3 10.4 228 0.53
Free open area (FOA)
FOA Cd EFA Performance Level
35% 0.53 0.18 Class 1
  • Penetration rate
    Core Velocity
    (m/s)    		 Penetration
    Rate (L/h.m2)    		 Effectiveness Rain Penetration Class
    0 0.0 1.000 A
    0.5 0.0 1.000 A
    1 0.5 0.993 A
    1.5 2.6 0.965 B
    2 7.8 0.896 C
    2.5 10.9 0.854 C
    3 13.0 0.826 C
    3.5 14.6 0.806 C
  • Sonic Series acoustic louvre SL4-30C datasheet PDF
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  • AcousTech Sonic Series acoustic louvre SL4-30C line drawing PDF
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  • AcousTech Sonic Series acoustic louvre SL4-30C - DWG DWG
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  • AcousTech Sonic Series acoustic louvre SL4-30C - RFA RFA
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