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Absorptive Silencers

S200/100

Description

The Series S 200/100 silencers are absorptive type silencers made of standard dissipative elements. The dissipative elements are made of fiber material wrapped in glass fiber or PVC film and they are inserted in a casing of galvanized sheet or treated with anti-rust. These elements are contained in perforated galvanized sheets. The thickness of the dissipative elements of the Series 200/100 is equal to the air passage. As shown in Figure 4, we produce five standard models with varying basic length: mm 1000, 1500, 2000, 2500, and 3000 for various values of BxH section.


Applications

The absorptive silencers Series S 200/100 are designed for all airborne noise control, and particularly:

  • Ventilation and air conditioning systems
  • Intake or outlet of fumes or air
  • Air cooling for machinery and compressors etc.
  • Intake or outlet of large ventilation systems
  • Ventilation of soundproofed enclosures

Figure 2


Which Type of Silencer to Choose

The selection of the best suited silencer is based on:
AERODYNAMIC PROPERTIES – (BxH)
ACOUSTIC – (L)
AERODYNAMIC PROPERTIES: the size of section BxH can be calculated using Figure 3 modeling of air flow capacity as function of the head loss.
ACOUSTIC PROPERTIES: the values of noise mitigation per octave bands of the Series S 200/100 silencers vary depending on the length and can be calculated with the diagram in Figure 5.
For noise remediation requirements different than those indicated in the diagram, we can provide silencers’ dissipative elements with different thickness.


Example

For an air duct with flow capacity of 20.000 m 3 / h and with maximum head loss of 10 mm. H2 0, Figure 3 diagram indicates a silencer type S202/100 (BxH = 800 x 1000 mm.).
If the noise abatement required is greater than 25dB at the octave frequency of 250 Hz then Figure 5 indicates the usage of a silencer with L = 1500 mm.


Head Loss


Figure 3


List of Standard Types

B
H
L = 1000
L = 1500
L = 2000
L = 2500
L = 3000
400
1000
S 201/100/1000
S 201/100/1500
S 201/100/2000
S 201/100/2500
S 201/100/3000
800
1000
S 202/100/1000
S 202/100/1500
S 202/100/2000
S 202/100/2500
S 202/100/3000
1200
1000
S 203/100/1000
S 203/100/1500
S 203/100/2000
S 203/100/2500
S 203/100/3000
1600
1000
S 204/100/1000
S 204/100/1500
S 204/100/2000
S 204/100/2500
S 204/100/3000
1200
2000
S 205/100/1000
S 205/100/1500
S 205/100/2000
S 205/100/2500
S 205/100/3000
1600
2000
S 206/100/1000
S 206/100/1500
S 206/100/2000
S 206/100/2500
S 206/100/3000
1800
2000
S 207/100/1000
S 207/100/1500
S 207/100/2000
S 207/100/2500
S 207/100/3000
2000
2000
S 208/100/1000
S 208/100/1500
S 208/100/2000
S 208/100/2500
S 208/100/1000
2400
2000
S 209/100/1000
S 209/100/1500
S 209/100/2000
S 209/100/2500
S 209/100/3000

Dimensions in mm

Figure 4


Noise Mitigation

Figure 5


General Properties

Maximum Temperatures: 600 °C
Fire reaction: fire proof
Vibration resistance: excellent
Humidity resistance: excellent
Steam and gas resistance: excellent

These silencers’ characteristics are merely indicative. Alfakel retains the rights to apply further modifications.


Alfakel s.r.l. • Via G. Galilei 39/D • 42027 Montecchio Emilia (RE)
Tel. 0522 86.35.23 Fax 0522 86.60.08 • E-mail: info@alfakel.it



The descriptions of Alfakel’s products are merely indicative. Alfakel retains the rights to apply further modifications.




 

 



 


Alfakel s.r.l. • Via G. Galilei 39/D • 42027 Montecchio Emilia (RE) • P.IVA 01838090353
Tel. 0522 86.35.23 • Fax 0522 86.60.08 • e-mail:info@alfakel.it