Circular Duct Attenuators - S / P Series

  Features

  • These notes apply to both the open and pod type attenuators.

  Construction

  • The units are rigidly constructed and consist of an outer cylindrical galvanised steel casing, lined internally with no hygroscopic and incombustible sound absorbent material.
  • This material is retained by an inner perforated metal cylinder.
  • An impervious lining of the acoustic infill can be provided to prevent the ingress of moisture or grease.
  • There is a small performance penalty in high frequencies when an impervious lining is fitted.
  • Refer to our Sales Engineers if more information is required.

Insertion Loss

  • The values quoted in the table represent the difference between the sound power level (Lw) of a fan and attenuator combination and that of the fan alone.

Selection

  • To ascertain the sound power level of a fan fitted with an attenuator, the insertion loss should be subtracted from the sound power level (Lw) rating of the fan across the octave band centre-frequency spectrum quoted in the fan characteristic data (obtainable on request).
  • The fan sound power, Lw, ratings and attenuator insertion loss apply to in-duct operation and where an attenuator is connected between the fan and duct system.

Rectangular Attenuators

  • Whilst circular attenuators provide a convenient form of attenuation when used with axial flow fans and have the added advantage of minimising noise break-out, it is often more economical to consider standard rectangular attenuators.
  • Please refer to the pages G-6/10 for details of these.
  • Purpose-designed attenuators can be supplied for particularly demanding applications requiring performances or construction beyond that provided by our standard product.

  Suggested Specification

  • Attenuators shall be as designed and manufactured by Elta Fans and shall have the performances as scheduled.
  • The casing and end flanges shall be constructed from high quality galvanised mild steel sheet.
  • The end flanges shall be match drilled and tapped to suit the fan flanges and facilitate installation.
  • Attenuator pods, where fitted, shall be adequately supported and be fitted with a nose cone on the inlet to minimise noise regeneration and pressure loss.

  Dimensions

 
Model S1-Dia.
S2-Dia.
P1-Dia.
P2-Dia.
A
Type
S1
P1 
Type 
S1.5
P1.5
Type 
S2
P2
 .
 .
C E S1 S2 P1 P2
031 315 472 630 415 8  M8 355  13  26 15 30 
035 350  525  700  450  M8  395  14  28  16  32 
040 400  600  800  500  12  M10  450  23  34  25  38 
045 450  675  900  550  12  M10  487  25  38  33  50 
050 500  750  1000  650  12  M10  560  27  52  36  70 
056 560  840  1120  710  12  M10  620  30  57  41  75 
063 630  945  1155  780  12  M10  690  34  65  47  90 
071 710  1065  1420  80  16  M10  7700  50  83  70  116 
080 800  1155  1580  950  16  M10  860  55  92  78  130 
090 900  1350  1800  1100  16  M12 970  74  116  106  166 
100 1000  1500  2000 1200  16  M12  1070  90  140  127  198 
125 1155  1875  2310 1450  20  M12  1320  110  229  158  329 
140 1155  2100  2400  1631  24  M12  1470  122  254  177  369 
160 1800  2350  3600  1833  24  M12  1680  195  389  286  571 
180 1800  2700  3600  2034  24  M12  1880  217  434  321  642 
200 1800  3000  3600  2236  24  M12  2080  241  482  357  713 
*To determine weights of Q-Seal attenuators multiply the weights shown above by 0.85
 

  Performance

 
 
Performance Data - Open Type
    Static Insertion Loss, dB
Matching Length Octave Band Centre Frequency
Fan Dia. cm mm 63 125 250 500 1k 2k 4k 8k
S1-Dia. 1 Diameter Long (Nom.)
-031 315 1 3 5 9 13 10 8 7
-035 350 2 3 5 9 13 10 8 7
-040 400 2 3 5 9 13 10 8 7
-045 450 2 3 5 10 13 10 8 7
-050 500 2 3 6 10 14 10 8 7
-056 560 2 4 6 10 14 10 8 7
-063 630 3 4 7 13 14 9 8 6
-071 710 3 4 8 14 14 9 7 6
-080 800 3 4 8 14 13 9 7 6
-090 900 3 4 9 14 13 8 7 6
-100 100 3 4 9 14 12 8 7 6
-125 1155 3 4 10 14 12 8 6 6
-140 1155 3 5 10 13 11 8 5 5
-160 1800 4 6 11 13 10 7 5 5
-180 1800 4 6 11 13 10 6 5 5
-200 1800 4 6 11 13 9 6 5 5
S2-Dia. 2 Diameters Long (Nom.)
-031 630 3 6 9 15 21 17 14 13
-035 700 4 6 10 15 21 17 14 13
-040 800 4 6 10 16 21 18 15 13
-045 900 4 7 10 17 21 18 15 13
-050 1000 4 7 10 18 21 17 15 12
-056 1120 5 7 11 18 21 17 15 12
-063 1155 5 8 11 21 23 17 15 10
-071 1420 5 8 12 22 23 16 15 10
-080 1580 5 8 12 22 23 16 15 10
-090 1800 5 8 13 22 19 13 12 10
-100 2000 6 8 13 22 19 13 12 10
-125 2310 6 8 13 21 18 13 12 11
-140 2400 7 9 15 21 18 11 11 10
-160 3600 8 9 15 20 17 11 9 8
-180 3600 8 9 15 20 17 10 9 8
-200 3600 8 9 15 20 17 10 9 8
 
 
Performance Data - Open Type        
Static Insertion Loss, dB       
Matching Length  Octave Band Centre Frequency       
Fan Dia. cm  mm  63 125 250 500 1k 2k 4k  8k 
 P1-Dia. 1 Diameter Long (Nom.)        
-031  315 3 6 8 13 20  19  16   22
-035   350 4 13  20  19  16  22 
-040  400  4 14 21  19  16  23 
-045  450  4 15  21  19  16  23 
-050  500  4 15  22  19  15 22 
-056  560  4 15  22  19  15  22 
-063  630  4 10  18  22  19  15  20 
-071  710  5 10  18  22  19 15  20 
-080  800  5 10  18  24   17 15  20 
-090  900  5 11  20  20  16  13  19 
-100  1000  5 12  20  19  14  13  19 
-125  1155  5 12  20  19  14  13  17 
-140  1155  5 12  19 16  14  12  16 
 -160 1800  5 12  18  17  12  10  15 
-180  1800  5 12  18  17  12  10  15 
-200  1800  5 12  18 17  12  10  15 
P2-Dia. 2 Diameters Long (Nom.)         
-031  630 6 9 14  21  28  28  25 22
-035  700  14  21  28  28  25  22 
-040  800  14  22  29  28  26  23 
-045  900  14  22  29  28  26  23 
-050  1000  10  14  24  30  29  27  22 
-056  1120  10  14  24  30  29  27  22 
-063  1155  11  16  28  33  32  29  20 
-071  1420  11  16  28  34  31  28  20 
-080  1580  11  16  28  34  31  28  20 
-090  1800  11  18  27  28  27  23  19 
-100  2000  11  19  27  29  27  23  19 
-125  2310  11  19  27  28  27  22  17 
-140  2400  12  20  26  28 26  19  16 
-160  3600  10  14  21  26 26 26  16  15 
-180  3600  10  14  21  26  28  26  18  15 
-200  3600  10  14  21  26  28  26  18  15 

  Technical Data

  

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