Home > Sonic Series acoustic louvre SL4-45

Sonic Series acoustic louvre SL4-45

The Sonic Series acoustic louvre SL4-45 is a 450mm deep acoustic louvre designed to provide controlled airborne sound reduction while maintaining airflow performance. Use it where increased acoustic attenuation is required and system depth allows for a deeper louvre configuration.

Engineered to balance acoustic attenuation, airflow performance and weather protection, the SL4-45 provides greater airborne sound reduction than shallower Sonic Series acoustic louvre configurations while maintaining a 35% free open area.

Product Properties Test Data Technical Information

  • Product name:

    AcousTech Sonic Series acoustic louvre SL4-45

  • Weighted Sound Reduction Index (Rw):

    Rw 29 (C −1, Ctr −3) assessed to AS 1191-2002, rated to AS/NZS ISO 717.1

  • Insertion loss:

    23dB (C −1, Ctr −3)

  • Free open area (FOA):

    35%

  • Effective flow area (EFA):

    0.28m² (1000 × 1000mm reference specimen)

  • Discharge coefficient (Cd):

    0.80

  • Airflow classification:

    Class 1 to AS 4740

  • Rain penetration class:

    Class C (overall) / Class C (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 13 17
125 18
160 20
200 21 21
250 22
315 23
400 26 26
500 26
630 27
800 28 29
1000 29
1250 30
1600 30 31
2000 31
2500 31
3150 32 31
4000 31
5000 30
Pressure drop
Face Velocity
(m/s)		 Throat Velocity
(m/s)		 Pressure Drop (Pa) Cd (-)
0.5 2.3 5 0.79
1 4.5 18 0.81
1.5 6.8 43 0.81
2 9.1 77 0.80
2.5 11.4 120 0.81
3 13.6 172 0.81
Free open area (FOA)
FOA Cd EFA Performance Level
35% 0.80 0.28 Class 1
  • Penetration rate
    Core Velocity
    (m/s)    		 Penetration
    Rate (L/h.m2)    		 Effectiveness Rain Penetration Class
    0 7.3 0.903 C
    0.5 8.3 0.889 C
    1 9.4 0.875 C
    1.5 9.9 0.868 C
    2 10.4 0.861 C
    2.5 11.5 0.847 C
    3 13.0 0.826 C
    3.5 14.6 0.806 C
  • Sonic Series acoustic louvre SL4-45 datasheet PDF
    Download
  • AcousTech Sonic Series acoustic louvre - Information pack PDF
    Download
  • AcousTech Sonic Series acoustic louvre SL4-45 line drawing PDF
    Download
  • AcousTech Sonic Series acoustic louvre SL4-45 - DWG DWG
    Request a Copy
  • AcousTech Sonic Series acoustic louvre SL4-45 - RFA RFA
    Request a Copy