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Sonic Series acoustic louvre SL4-60

The Sonic Series acoustic louvre SL4-60 is a 600mm deep acoustic louvre designed to provide controlled airborne sound reduction while maintaining airflow performance. Specify where acoustic attenuation is the primary design constraint and system depth allows for a deeper louvre configuration.

Engineered to balance acoustic attenuation, airflow performance and weather protection,the SL4-60 provides the highest airborne sound reduction of any acoustic louvre in the Sonic Series range. With a Weighted Sound Reduction Index of Rw 33, it exceeds the acoustic performance of comparable chevron blade configurations while maintaining Class 1 airflow performance and a 35% free open area.

Product Properties Test Data Technical Information

  • Product name:

    AcousTech Sonic Series acoustic louvre SL4-60

  • Weighted Sound Reduction Index (Rw):

    Rw 33 (C −1, Ctr −4) assessed to AS 1191-2002, rated to AS/NZS ISO 717.1

  • Insertion loss:

    27dB (C −1, Ctr −4)

  • Free open area (FOA):

    35%

  • Effective flow area (EFA):

    0.29m² (1000 × 1000mm reference specimen)

  • Discharge coefficient (Cd):

    0.83

  • Airflow classification:

    Class 1 to AS 4740

  • Rain penetration class:

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

  • Fire rating:

    Manufactured from non-combustible materials

  • Test standards:

    AS/NZS ISO 717.1 | AS 4740

  • 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 18 20
125 20
160 22
200 26 27
250 27
315 28
400 29 30
500 30
630 32
800 31 32
1000 31
1250 34
1600 35 35
2000 35
2500 36
3150 37 36
4000 36
5000 36
Pressure drop
Face Velocity
(m/s)		 Throat Velocity
(m/s)		 Pressure Drop (Pa) Cd (-)
0.5 2.3 4.5 0.83
1 4.5 18 0.83
1.5 6.8 41 0.83
2 9.1 74 0.82
2.5 11.4 113 0.83
3 13.6 164 0.83
Free open area (FOA)
FOA Cd EFA Performance Level
35% 0.83 0.29 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 1.0 0.986 B
    1 4.2 0.944 C
    1.5 4.7 0.938 C
    2 5.2 0.931 C
    2.5 5.2 0.931 C
    3 5.7 0.924 C
    3.5 6.3 0.917 C
  • Sonic Series acoustic louvre SL4-60 datasheet PDF
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  • AcousTech Sonic Series acoustic louvre SL4-60 line drawing PDF
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  • AcousTech Sonic Series acoustic louvre SL4-60 - DWG DWG
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  • AcousTech Sonic Series acoustic louvre SL4-60 - RFA RFA
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