Acoustics type 1

Grooving width 20 mm, length 250 mm
Grid: 81/400 mm

αw = 0.55
Sound absorption class: D

Acoustics type 2

Perforation diameter 30 mm
Grid 81/75 mm

αw = 0.50
Sound absorption class: D

Acoustics type 3

Perforation 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

Stripe-perforation 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

Perforation diameter 15 mm
Grid 40/40 mm

αw = 0.65
Sound absorption class: C

Acoustics type 5.1

Stripe-perforation diameter 15 mm
Grid 40/40 mm

αw = 0.50
Sound absorption class: D

Acoustics type 6

Perforation diameter 9 mm
Grid 20/20 mm

αw = 0.80
Sound absorption class: B

Acoustics type 6.1

Stripe-perforation diameter 9 mm
Grid 20/20 mm

αw = 0.60
Sound absorption class: C

Acoustics type 8

Grooving width 9 mm, length 380 mm
Groove interval 48 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

Stripe-grooving width 9, length 380 mm
Groove interval 48 mm

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

Acoustics type 9

Grooving width 5.5 mm, length 380 mm
Groove interval 24 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

Stripe-grooving width 5.5 mm, length 380 mm
Groove interval 24 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.