AXIAL FLOW FANS GENERAL INFORMATION - Fantech

1 AXIAL FLOW FANS GENERAL INFORMATIONAXIAL FLOW FANS PERFORMANCE DATAC-2 Fantech 2016 INTRODUCTIONThis section of the catalogue details the performances of a wide range of AXIAL flow fantypes as follows:-The above fans range in diameter from 315mm to 2000mm. The curves shown on pages C-12 to C-24 show a range of performances for the AP sseriesof direct-driven AXIAL flow fans in Type D Installation (see below). The other fan types listed above incorporate casings or housings that impact on theirperformance result. The Fans by Fantech Product Selection Program will produceperformance curves for these other fan types that have automatically taken these losses into STANDARDSThe International Standards Organisation (ISO) achieved a standardised fan test codewith the publication of ISO5801:1997.

2 This Standard replaces BS848:Part 1, 1980 uponwhich it was based. Fan performances for the Elta 1000 Series diameter have been aerodynamically testedto BS848:Part 1, 1980 and the Elta 1400 and 2000 Series to ISO5801:1997. All threeseries have been tested to BS848:Part 2, 1985 for sound main difference between the above Standards and those they replaced, is theinstallation Types A, B, C and D such that, if a fan unit is designed for use in any one ofthese arrangements, the variation in performance should be established and BS848:Part 1, 1980 and ISO5801:1997 reflect the latest understanding ofmeasuring techniques and accuracy in fan performance the same fans were tested to pre-1980 air flow and noise Standards and then to thelatest Standards, different performances would be obtained.

3 The results from the laterStandards give differences of as much as:-O-5% in volumeO-10% in pressureO-5% in efficiencyO+2 to 6dB in noiseThese differences should be borne in mind when making comparisons of fans tested tothe different Standards, as they are the result of the test method and not the inletFree outletTYPECD ucted inletFree outletTYPEBFree inletDucted outletTYPEDD ucted inletDucted outletDuct Mounted AXIAL FansOAP Series - direct drivenOAPS Series - direct driven, smoke spillOAPB Series - belt-drivenOBFA Series - bifurcated, direct drivenWall Mounted FansOSQ Series - square plate, direct drivenAxial Roof UnitsORDE/RDLE Series - downflow cowl, exhaustORDS Series - downflow cowl.

4 SupplyORVE/RVLE Series - vertical dischargeORSS/RSSL Series - vertical discharge, smoke spillOHC Series - high capacity, verticaldischargeOSS Series - smoke spillCAxial Flow 4/11/2015 2:01 PM Page 2 Fantech 2016C-3 AXIAL FLOW FANS PERFORMANCE DATACAXIAL FLOW FANS GENERAL INFORMATIONPERFORMANCE VARIATIONSThe achieved fan performances can differ from the test performances shown on thesubsequent pages due to two main effects:-a) The encroachment of irregular or abrupt changes within the system close to the good design practice is followed, then the fan willreceive nearly uniform air into its inlet, and discharge itsair flow in an almost ideal pattern.

5 If this is achieved thefan will perform to its expected to the "Do's and Don'ts" tips on page P-1willassist in avoiding pitfalls. The advice in "Do's and Don'ts"applies to the application of all fans, not just AXIAL ) Changes to the internal elements of the fan: largejunction boxes on motors, belt drive stacks or excessiveblade tip OF RUNNINGThe main series of tests were conducted on Form B units and comparative tests werecarried out on Form A units. Resultant performance differences occur mainly on theoutlet side of the fan, as correct practice should result in the presence of a duct or inletcone on the fan GUIDE VANESA normal AXIAL flow fan, whilst being very economical andcompact, imparts motion to the air in an AXIAL androtational direction.

6 The rotating component is usuallycalled swirl . The swirl component eventually dissipates,but by using Down Stream Guide Vanes (DSGV) it can beconverted to more useful static pressure. Static pressureincreases of 10%-25% can be achieved with DSGVs, thusgiving an increase in efficiency. As the work is done afterthe air leaves the fan, DSGVs do not require anyadditional fan power. They are most effective at pitchangles over 20 and produce small increase in soundlevels of 1-2dB. NormaloperatingrangeAxial Flow 4/11/2015 2:01 PM Page 3 AXIAL FLOW FANS GENERAL INFORMATIONAXIAL FLOW FANS PERFORMANCE DATAC-4 Fantech 2016 CMULTI-STAGE AXIAL FLOW FANSM ulti-stage AXIAL fans with contra-rotating impellers can be supplied up to 2000mm two-stage assembly develops approximately times the pressure developed by asingle-stage fan and increases the overall sound level by 8 to 10 select a contra-rotating AXIAL fan from the curves in this catalogue, divide thespecified static pressure by and then select as though it were a single-stage kW derived is for one stage only and the noise level will be 8 to 10 dB higher thanthe single-stage.

7 Reference should be made to Fantech for complete selections of these fanarrangements. Alternatively selections can be made using the Fans by Fantech ProductSelection IMPELLER RANGEThe Elta impeller ranges included in this catalogue have harnessed the latesttechnology in AXIAL impeller design, resulting in enhanced pressure development,energy efficiency and reduced noise are three main ranges: -Elta 1000: 315 to 1000mm diameter using 150 or 250mm diameter 1400: 800 to 1400mm diameter using 255 or 350mm diameter 2000: 1250 to 2000mm diameter using 400 or 550mm diameter performances beyond those detailed in this catalogue, and for applications suchas mine and tunnel ventilation, please refer to our sales engineers for SPECIFICATIONSB ladesThe blades have been designed for optimal performance, for both aerodynamic needsas well as noise characteristics.

8 They are available in a range of materials as shownbelow:-Impeller RangesThe stress limits of the blades vary from one material to another and simplified criteriaare incorporated on the curves. However, if selecting fans using the Fans by FantechProduct Selection Program, you may find solutions where higher pitch angles arechosen; these selections are quite should be noted that, as we are constantly reviewing the materials we use, theselimits may be hubs use Fantech TECH-LOCK taper bushes as standard. The bush ensures ease offitting and removal of the impeller from the motor shaft should adjustment of the pitchangle, cleaning or repair of the impeller prove necessary.

9 FixingsAll impellers are assembled using high-tensile, zinc-plated set screws and self-locking ofdiametersNo of bladesHub DiammMaterials 315 to 9005 or 10150 GRP, Nylon, Alum. or Anti-static GRP560 to 10007 or 14250 GRP, Nylon, Alum. or Anti-static GRP800 to 12503 or 6255 GRP, Alum. or Anti-static GRP800 to 14003, 6, 9 or 12350 GRP, Alum. or Anti-static GRP1000 to 18003, 6 or 9400 GRP or Aluminium1250 to 20003, 6, 9 or 12550 GRP or AluminiumAxial Flow 4/11/2015 2:01 PM Page 4 Fantech 2016C-5 AXIAL FLOW FANS PERFORMANCE DATACAXIAL FLOW FANS GENERAL INFORMATIONH andingRight and left-hand blades are available enabling the selection of contra-rotating ormulti-stage AXIAL flow fans up to 2000mm diameter.

10 If contra-rotating fans of alarger diameter are required please refer to our sales MaterialGRP blades will be supplied for normal clean ventilation applications as standardexcept where otherwise specified, or where local regulations prohibit their use. BalanceThe balance of all impellers is carefully checked before leaving our facilities toensure vibration-free BladesAll impeller pitch-angles are fully adjustable. For the Elta Range, up to size 1400,the required blade angles are set on jigs but sizes up to 1000 may also be setutilising the graduated scale at the root of each blade. For the Elta 2000 Range,pitch angle setting is by SPEEDS AND TEMPERATURESI mpellers installed for applications are submitted to the vibration, cyclictorques and temperature cycles that prevail within the item of equipment.