Acoustic Louvres
The Crossflow ALS (CALS) range is a fabricated acoustic louvre designed for commercial projects where reduction in sound transmission is required whilst maintaining weathered ventilation. The CALS louvre is suitable for all applications and can be both vertically and horizontally mounted into pre-formed structural opes. The modular units can be manufactured to suit specific dimensions on site. Each louvre blade is filled with a sound absorption mineral wool to achieve the required acoustic performance. They are quick to install with all fixings being grade A4 stainless steel and are virtually maintenance free
MATERIALS
- Outer frame casing manufactured from 18 gauge galvanised steel.
- Louvre blades manufactured from 22 gauge galvanised steel.
- Acoustic medium-tissue faced 45kg/m3. Non toxic, vermin and moisture proof mineral wool (packed to +10% compression to eliminate voids).
- Perforated galvanised sheet to rear of blades.
- Metal or aluminium bird mesh as standard.
LOUVRE OPTIONS
- Perimeter flashings to suit application.
- HDPE insect screen.
- Blanking Plate as required.
- Flanged or glazing outer frame.
- Available in galvanised steel, 2mm aluminium, polyester powder coat finish to any RAL colour, and stainless steel.
Crossflow Acoustic Louvres - Sound Transmission
| Model | Louvre Depth (mm) | 63 | 125 | 250 | 500 | 1K | 2K | 4K | 8K | |
| CALS 100 | 100 | 5 | 4 | 5 | 6 | 9 | 13 | 14 | 13 | |
| CALS 150 | 150 | 6 | 6 | 8 | 10 | 14 | 18 | 16 | 15 | |
| CALS 275 | 275 | 6 | 5 | 8 | 9 | 17 | 17 | 14 | 14 | |
| CALS 300 | 300 | 6 | 7 | 10 | 12 | 18 | 18 | 14 | 13 | |
| CALS 300 C | 300 | 6 | 6 | 8 | 13 | 18 | 20 | 16 | 17 | |
| CALS 600 C | 550 | 7 | 9 | 12 | 24 | 31 | 33 | 29 | 30 |
How to specify Crossflow CALS Louvres
Supply and install CALS louvres as manufactured by Crossflow Ltd. Outer frame casing shall be made from 18 gauge (1.2mm) galvanised steel. Louvre blades shall be made from 22 gauge (0.7mm) galvanised steel. Louvre blades to be filled with acoustic medium-tissue faced, non-toxic, vermin and moisture proof mineral wool to achieve the required acoustic performance as indicated.
- Static pressure drop of the louvres not to exceed ______
- Pa at a face velocity of _____ m/sec
- Louvre to have galvanised bird mesh fitted to the rear as standard.
- Louvre finish to be_____ in RAL colour _____
Click here to download the PDF.
CALS 100 - Standard Acoustic Louvre
| CALS – 100 ACOUSTIC PERFORMANCE | ||||||||
| Octave band Centre frequency (Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
| Transmission Loss (dB) | 5 | 4 | 5 | 6 | 9 | 13 | 14 | 13 |
| CALS – 100 AERODYNAMIC PERFORMANCE | |||||||||||
| Static Pressure Drop (N/m2) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | |
| Face Velocity (m/s) | 0.92 | 1.30 | 1.59 | 1.84 | 2.05 | 2.25 | 2.43 | 2.61 | 2.76 | 2.90 | |
| Nominal Free Area (%) | 42% | ||||||||||
CALS 150 - Standard Acoustic Louvre
| CALS – 150 ACOUSTIC PERFORMANCE | ||||||||
| Octave band Centre frequency (Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
| Transmission Loss (dB) | 6 | 6 | 8 | 10 | 14 | 18 | 16 | 15 |
| CALS – 150 AERODYNAMIC PERFORMANCE | ||||||||||
| Static Pressure Drop (N/m2) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Face Velocity (m/s) | 0.53 | 0.73 | 0.90 | 1.04 | 1.16 | 1.28 | 1.37 | 1.47 | 1.56 | 1.64 |
| Nominal Free Area (%) | 32% | |||||||||
CALS 275 - Standard Acoustic Louvre
| CALS – 275 ACOUSTIC PERFORMANCE | ||||||||
| Octave band Centre frequency (Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
| Transmission Loss (dB) | 6 | 5 | 8 | 9 | 17 | 17 | 14 | 14 |
| CALS – 275 AERODYNAMIC PERFORMANCE | ||||||||||
| Static Pressure Drop (N/m2) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Face Velocity (m/s) | 0.90 | 1.15 | 1.48 | 1.79 | 2.05 | 2.15 | 2.40 | 2.60 | 2.77 | 2.84 |
| Nominal Free Area (%) | 42% | |||||||||
CALS 300 - Standard Acoustic Louvre
| CALS – 300 ACOUSTIC PERFORMANCE | ||||||||
| Octave band Centre frequency (Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
| Transmission Loss (dB) | 6 | 7 | 10 | 12 | 18 | 18 | 14 | 13 |
| CALS – 300 AERODYNAMIC PERFORMANCE | ||||||||||
| Static Pressure Drop (N/m2) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Face Velocity (m/s) | 0.94 | 1.31 | 1.61 | 1.83 | 2.13 | 2.27 | 2.46 | 2.63 | 2.84 | 2.99 |
| Nominal Free Area (%) | 45% | |||||||||
CALS 300 - Chevron Acoustic Louvre
| CALS – 300 ACOUSTIC PERFORMANCE | ||||||||
| Octave band Centre frequency (Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
| Transmission Loss (dB) | 6 | 6 | 8 | 13 | 18 | 20 | 16 | 17 |
| CALS – 300 AERODYNAMIC PERFORMANCE | ||||||||||
| Static Pressure Drop (N/m2) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Face Velocity (m/s) | 0.91 | 1.26 | 1.49 | 1.70 | 2.01 | 2.08 | 2.25 | 2.31 | 2.60 | 2.70 |
| Nominal Free Area (%) | 45% | |||||||||
CALS 600 - Chevron Acoustic Louvre
| CALS – 600 ACOUSTIC PERFORMANCE | ||||||||
| Octave band Centre frequency (Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
| Transmission Loss (dB) | 7 | 9 | 12 | 24 | 31 | 33 | 29 | 30 |
| CALS – 600 AERODYNAMIC PERFORMANCE | ||||||||||
| Static Pressure Drop (N/m2) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Face Velocity (m/s) | 0.68 | 0.94 | 1.15 | 1.30 | 1.47 | 1.61 | 1.77 | 1.89 | 2.02 | 2.13 |
| Nominal Free Area (%) | 45% | |||||||||
