Bifurcated Case Axial Fans (BIFA)
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- Julius Dennis
- 5 years ago
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1 Bifurcated Case Axial Fans (BIFA) Sizes 250 to 1000 dia Motors protected to IP55 Motor insulation Class F Maximum ambient temperature 200 C Speed controllable via transformer or inverter (when the ambient air temperature is not higher than 60 C) IP55 terminal box Suitable for relative humidity levels up to 95% RH Manufactured to BS EN ISO 9001 Performance tested to BS 848 parts 1, 2 and ISO Year Guarantee The Bifurcated Case Axial range has been specifically developed to meet the need for an axial fan which can handle atmospheres normally detrimental to the life of the fan motor. By isolating the motor from the system airstream, the bifurcated fan can handle a wide variety of saturated and dust-laden atmospheres, heated air and hot gases. The range has a split airway with a direct driven motor operating in ambient air within the motor compartment. They are suitable, as standard, for handling air temperatures up to +200 C. The Bifurcated Case Axial Fan range has a number of accessories available which include: Axial Ancillary Pack, Attenuator, Wire Inlet Guard, Coupling Flanges, Mounting Feet, AV Mounts and Speed Controllers. Impellers and Casing The aluminium alloy impellers are die cast and have an adjustable pitch which allows a wide range of air outputs to be selected. All the casings are manufactured in steel and hot dipped galvanised to BS EN ISO 1461 after fabrication. Motor mountings and fixings used in the assembly of the fan are zinc plated and passivated. Form of Running Bifurcated fans have arrows showing the direction of the impeller rotation and airflow. All models are Form B running. Terminal Box To IP55, protected against dust and water jets from any angle, allowing outside applications. Motors The motors are specially selected to operate within the motor compartment with the airstream in the duct system, at an elevated temperature. Motors are of the B3 foot mounting type, totally enclosed and fan cooled. Being foot mounted the motors can, in the event of a failure, be readily interchanged with a comparable frame size from a wide range of manufacturers to cover temperatures of up to 200 C. Where indicated, the motor is suitable for speed control by either an inverter or a 5-step auto transformer speed controller when the ambient air temperature is not higher than 60 C. Electrical Single phase V/50 Hz supply are available in two sizes 250 and 315 dia. in either 2 or 4 pole versions. Three phase V/50Hz supply are available in nine sizes 250, 315, 400, 500, 630, 710, 800, 900 and 1000 dia. in either 2 or 4 pole versions (710, 800, 900 and 1000 dia are only available as 4 pole). Performance Tested to BS 848 Part 1 & 2. Published db(a) figures are free field sound pressure levels at 3m with spherical propagation at a reference level of 2 x 10 5 Pa (20 micro-pascal). The inlet and outlet sound power level spectra figures are db with a reference of Watts (1 pico- Watt). Cooling External cooling is provided by a fan mounted at the non-drive end of the motor, protected by a cover with a grid air intake. The airflow, guided by the fan cover, is directed longitudinally on the entire periphery of the motor in the channels formed by the frame ribs. Adequate space is provided within the motor compartment to ensure a plentiful supply of cooling air. The air within the motor compartment must not exceed 40 C. For ambients in excess of this, please consult our Technical Services Department for further information. 276
2 Fan Dimensions (mm) BIFA25 - BIFA50 C P.C.D. Rotation e No. OF HOLES f Ø HOLES b hø dø Over Flanges C L g aø Inside Air Flow. (B Form). Model No. Pole Phase Pitch Angle aø b c d e f g hø Approx. Weight kg BIFA25 2&4 1& BIFA31 2&4 1& BIFA40 2&4 1& BIFA45 2&4 1& BIFA50 4 1& BIFA BIFA63 - BIFA100 Rotation B C P.C.D. E No OF HOLES F Ø HOLES D Ø Over Flanges C L G A Ø Inside Air Flow. (B Form). Model No. Pole Phase Pitch Angle a b c d e f g Approx. Weight kg BIFA56 2& BIFA63 2& BIFA BIFA BIFA BIFA
3 BIFA25-1 & - 2 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP Phase Poles Spectrum k 2k 4k 8k 3m 250 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet
4 BIFA31-1 & - 2 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP Phase Poles Spectrum k 2k 4k 8k 3m 315 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet
5 BIFA40-1 & - 2 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Phase Poles Spectrum k 2k 4k 8k 3m 400 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
6 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 450 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
7 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 500 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
8 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 560 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
9 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 630 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
10 BIFA25-1 & - 4 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP Phase Poles Spectrum k 2k 4k 8k 3m 250 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet
11 BIFA31-1 & - 4 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP Phase Poles Spectrum k 2k 4k 8k 3m 315 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet
12 BIFA40-1 & - 4 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP Phase 1 Phase Poles Spectrum k 2k 4k 8k 3m 400 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet
13 BIFA45-1 & - 4 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP Phase Poles Spectrum k 2k 4k 8k 3m 450 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet
14 BIFA50-1 & - 4 Pole Phase IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP BIFA BIFA IP Phase Poles Spectrum k 2k 4k 8k 3m 500 BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet BIFA BIFA Inlet/Outlet
15 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 560 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
16 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 630 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
17 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 710 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
18 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 800 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
19 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 900 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
20 BIFA Pole IP Curve m 3 /s at Pa Motor dba Poles rpm Rating Ref BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP BIFA IP Poles Spectrum k 2k 4k 8k 3m 1000 BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet BIFA Inlet/Outlet
21 Electrical Details 1 Phase 2 Pole *edemand Controller rpm Pitch Angle Motor kw S.C. Amps F.L.C Amps Starting Method Starter Ref Overload Ref Transform Controller Voltage Control 1/ Inverter Inverter BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L *1 phase 2 pole are not speed controlable 2 Pole edemand Controller rpm Pitch Angle Motor kw S.C. Amps F.L.C Amps Starting Method Starter Ref Overload Ref Transform Controller Voltage Control 1/ Inverter Inverter BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L Phase 4 Pole edemand Controller rpm Pitch Angle Motor kw S.C. Amps F.L.C Amps Starting Method Starter Ref Overload Ref Transform Controller Voltage Control 1/ Inverter Inverter BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L LCA Star Delta
22 Electrical Details 4 Pole edemand Controller rpm Pitch Angle Motor kw S.C. Amps F.L.C Amps Starting Method Starter Ref Overload Ref Transform Controller Voltage Control 1/ Inverter Inverter BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA Star Delta BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA Star Delta BIFA Star Delta BIFA D.O.L BIFA D.O.L BIFA D.O.L BIFA Star Delta BIFA Star Delta BIFA Star Delta BIFA Star Delta Speed Controllers Used in conjunction with speed controllable fans Vent-Axia offers a choice of speed controllers, the traditional Five-Step Auto Transformer or the Inverter Speed Controller. The Five-Step-Auto Transformer provides five stepped speed settings without the electronic motor harmonic noise associated with all electronic or solid state type Speed Controllers. For edemand Speed Controllers & Inverters see Accessories & Controls Section. 297
23 Accessory Dimensions (mm) Coupling Flange Rolled from mild steel. Dimensionally matched to fan flange and fixing holes. Number of holes Inlet Wire Guard K factor loss 0.25 Available for direct fixing to either side of the fan using flange sizing holes. Constructed to meet BS 848 Part 5. a Ø b c Ø d Ø e Ø n A A A *Anti-Vibration Mounts a b A A A A For more information on the K factor, refer to General Information Section *Mounting Feet Max. Load A B C D E F G H kg 68MP033G M MP055B M MP133G M MP165R M *Supplied as a set of 4 a b c d e f g h i A A A A *Supplied as a pair 298
24 Accessories Model Ref Mounting Feet Inlet Wire Guard Coupling Flange Ancillary Pack* Attenuator Attenuator inc. Pod Anti-Vibration Mount** BIFA HT MP033G BIFA HT MP033G BIFA HT MP033G BIFA HT MP033G BIFA HT MP033G BIFA HT MP033G BIFA HT MP033G BIFA A A HT A MP055B BIFA A A HT A MP055B BIFA A A HT A MP133G BIFA A A HT A MP133G *Axial Ancillary Pack consists of 2 Matching flanges, 2 Flexible Connectors, 2 Mounting Feet, 4 Anti Vibration Mounts and 4 Worm Drive Clips **Supplied as a set of 4 Typical Installation Vent-Axia attenuator length = 1 1 /2 x duct dia. Pod available for extra attenuation Class F motor insulation as standard Motors and Terminal Box protected to IP55 against dust and water jets DUCT DUCT *Cased axial ancillary pack consists of 2 matching flanges, 2 flexible connections, 2 mounting feet, 4 anti-vibration mounts and 4 worm drive clips 299
25 Fan Attenuator Details An attenuator without Pod offers negligible resistance to air flow, and therefore the pressure loss can be considered to be the same as that for the equivalent length of ducting. Resistance Graph for Axial Attenuator with Pod RESISANCE (Pa) MEAN DUCT VELOCITY m/s Attenuator Insertion Loss Data Dia k 2k 4k 8k kg approx Melinex lined attenuators are available on request Case Axial Attenuator Fitted with Pod Insertion Losses Dia k 2k 4k 8k kg approx
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