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Sonic Series acoustic louvre SL4-10

The Sonic Series acoustic louvre SL4-10 is a 100mm deep acoustic louvre designed to provide controlled airborne sound reduction while maintaining airflow performance. Use it where system depth is limited and ventilation requirements must be balanced with acoustic attenuation.

Engineered to balance acoustic attenuation, airflow performance and weather protection, the SL4-10 is a low-depth, high-airflow configuration within the Sonic Series acoustic louvre range, designed for applications where space constraints prevent the use of deeper acoustic louvres.

Product Properties Test Data Technical Information

  • Product name:

    AcousTech Sonic Series acoustic louvre SL4-10

  • Weighted Sound Reduction Index (Rw):

    Rw 18 (C −1, Ctr −2) assessed to AS 1191-2002, rated to AS/NZS ISO 717.1

  • Insertion loss:

    12dB (C −1, Ctr −2)

  • Free open area (FOA):

    22%

  • Effective flow area (EFA):

    0.2 m² (1000 × 1000mm specimen)

  • Discharge coefficient (Cd):

    0.87

  • Airflow classification:

    Class 1 to AS 4740

  • Rain penetration class:

    Class D to AS 4740

  • 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 9 10
125 10
160 11
200 12 12
250 12
315 12
400 14 15
500 15
630 16
800 17 18
1000 18
1250 19
1600 20 21
2000 22
2500 24
3150 23 21
4000 21
5000 20
Pressure drop
Face Velocity
(m/s)		 Throat Velocity
(m/s)		 Pressure Drop (Pa) Cd (-)
0.5 2.53 5 0.877
1 5.05 20 0.877
1.5 7.58 45 0.877
2 10.10 80 0.877
2.5 12.63 126 0.873
3 15.15 182 0.872
Free open area (FOA)
FOA Cd EFA Performance Level
22% 0.87 0.2 Class 1
  • Weather performance
    Core Velocity
    (m/s)    		 Penetration
    Rate (L/h.m2)    		 Effectiveness Rain Penetration Class
    0 10.4 0.861 C
    0.5 15.6 0.792 D
    1 18.2 0.757 D
    1.5 18.8 0.750 D
    2 19.8 0.736 D
    2.5 20.8 0.722 D
    3 23.4 0.688 D
    3.5 26.0 0.653 D
  • AcousTech Sonic Series acoustic louvre SL4-10 datasheet PDF
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  • AcousTech Sonic Series acoustic louvre SL4-10 line drawing PDF
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  • AcousTech Sonic Series acoustic louvre SL4-10 - DWG DWG
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  • AcousTech Sonic Series acoustic louvre SL4-10 - RVIT RFA
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