Acoustics type 1

Slit size: 20/250 mm
Grid: 81/400 mm

αw = 0.55
Sound absorption class: D

Acoustics type 2

Hole diameter: 30 mm
Grid: 81/75 mm

αw = 0.50
Sound absorption class: D

Acoustics type 3

Hole diameter: 20 mm
Grid: 40/40 mm

αw = 0.90, with additional slat αw = 0.85
Sound absorption class A, with additional slat sound absorption classe B

Acoustics type 3.1

Hole diameter: 20 mm
Grid: 40/40 mm

αw = 0.75, with additional slat αw = 0.60
Sound absorption class C, with additional slat sound absorption class C

Acoustics type 5

Hole diameter: 15 mm
Grid: 40/40 mm

αw = 0.65
Sound absorption class: C

Acoustics type 5.1

Hole diameter: 15 mm
Grid: 40/40 mm

αw = 0.50
Sound absorption class: D

Acoustics type 6

Hole diameter: 9 mm
Grid: 20/20 mm

αw = 0.80
Sound absorption class: B

Acoustics type 6.1

Hole diameter: 9 mm
Grid: 20/20 mm

αw = 0.60
Sound absorption class: C

Acoustics type 8

Slit size: 9/380 mm
Grid: 48/600 mm

αw = 0.50, with additional slat αw = 0.50 
Sound absorption class D, with additional slat sound absorption class D

Acoustics type 8.1

Slit size: 9/380 mm
Grid: 48/600 mm

αw = 0.45, with additional slat αw = 0.40 
Sound absorption class D, with additional slat sound absorption class D

Acoustics type 9

Slit size: 5.5/380 mm
Grid: 24/600 mm

αw = 0.50, with additional slat αw = 0.55 
Sound absorption class D, with additional slat sound absorption class D

Acoustics type 9.1

Slit size: 5.5/380 mm
Grid24/600 mm

αw = 0.50, with additional slat αw = 0.50 
Sound absorption class D, with additional slat sound absorption class D

Statistical sound absorption coefficients dynamic design

The predicted statistical sound absorption coefficients of the acoustic elements with dynamic design are based on the data of the acoustics types 3, 3.1, 6 and 6.1.