BAE - SWSI & DWDI Airfoil Fans - Twin City Fan & Blower

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AccessoriesNested Inlet VanesExternal Inlet VanesVolume Control DevicesOutlet dampers, variable inlet vanes, and variable frequencydrives are three popular devices used to controlvolume for fan systems.Variable Inlet VanesVariable inlet vanes cause the entering air to spin inthe direction of wheel rotation, resulting in reduction involume, static pressure and brake horsepower and thusproviding an infinite number of fan curves approximatelyparallel to the original fan curve. Variable inlet vanescost about 50% to 80% more than outlet dampers butoffer significant savings in energy. Because of their simplicity,inlet vanes can be more reliable when comparedto variable frequency drives.STATIC PRESSURE10864200Performance Curvesat Different Vane Settings2550251007550751002001601208040BRAKE HORSEPOWERThere are two types of variable inlet vanes: nested(internal type) and bolted on (external type).Nested inlet vanes are built into the fan inlet cone andoffer the advantage of saving space and lower cost asopposed to the external type. They are available on allfan sizes 165 and larger. Twin City Fan & Blower offerscantilevered vanes to size 890 Class II fans to minimizeinsertion losses and noise associated with center hubdesign.External inlet vanes are bolted to the inlet of the fanand are available from size 122 to size 890. Use ofexternal vanes should be considered for hostile environmentssince operating linkages are shielded from theairstream. Both types of inlet vanes are available to600°F construction.0 2 4 6 8 10CFM IN 10000'sSYSTEM System CURVE CurveSP @ SP VANE @ Vane SETTING SettingBHP BHP @ VANE @ Vane SETTING SettingOutlet DampersThe closing of the damper adds to the resistance thatthe fan is working against. This moves the operatingpoint to the left of the initial rating point. The savings inhorsepower depends on the relative position on the fancurve and is usually much less than offered by othermethods. Outlet dampers are typically the least expensiveoption and should be considered when infrequentoperation at lesser capacity is desired or when handlinghot, humid or particulate laden air.Parallel BladeOutlet DamperOpposed BladeOutlet DamperThere are two types of outlet dampers: parallel bladeand opposed blade.Parallel blade dampers are recommended for systemswhere air volume is modulated between full-open toabout 75% of open.Opposed blade dampers cost about 10% more andare recommended for systems where volume is modulatedover the entire range. Opposed blades reduceair volume in a closer relationship to the control armmovement.8 Twin City Fan Catalog 370
AccessoriesVariable Frequency Drive (VFD)A VFD changes the fan speed and can provide thegreatest potential for energy savings, although athighest initial cost. A VFD should be considered forextended operation at part load conditions, especiallybelow 70% of the full volume operation.Access DoorsBolted, quick opening, and raised bolted access doorsare available for wheel inspection or maintenance.DrainThreaded pipe coupling welded to the lowest point inthe housing scroll. All fans come with a weep holein the bottom of the housing.Quick-OpenAccess DoorBoltedAccess DoorRaised BoltedAccess DoorShaft SealA shaft seal reduces leakage and protects the bearingsfrom a contaminated airstream. It is constructedof non-asbestos woven fibrous materials (ceramic felt)compressed between an aluminum cover plate andthe fan housing. A ceramic felt shaft seal does notmake the fan gas tight. A variety of special seals isavailable for low leakage applications requiring morepositive protection, including mechanical type stuffingboxes.Flanged InletA punched inlet flange is available for duct mounting.Flanged Outlet (DWDI Class I & II)A punched or unpunched flange is welded to the fanoutlet. An unpunched flanged outlet is standard onall SWSI and DWDI Class III and IV fans.Inlet/Outlet Companion FlangesCompanion flanges are used for installing the fan toflexible sleeve connections and are punched to matchthe fan’s inlet or outlet.Inlet and Outlet ScreensSafety screens are available for mounting in the faninlet or outlet in non-ducted applications.Special Paint & Protective CoatingsTwin City Fan & Blower has an in-house, specialtycoating facility to handle any type of coating requirement.Refer to Protective Coatings Guide ES-35 formore details.Extended Drain with PlugSafety ScreenShaft SealCompanion Inlet Flangewww.tcf.com9
Page 1 and 2: Air Moving Solutions.AIRFOIL fansBA
Page 3 and 4: Wheel ConstructionHigh efficiency,
Page 5 and 6: Arrangement 9SWSI — Single Width,
Page 7: StandardConfigurationsDesignation f
Page 11 and 12: Piezometer Ring (Airflow Measuring
Page 13 and 14: DWDISIZEMaximum RPM, Wheel Weights
Page 15 and 16: SWSI Class IIIFeatures & WeightsHOU
Page 17 and 18: BAE SWSI 122Fan Efficiency Grade =
Page 29 and 30: BAE DWDI 165Fan Efficiency Grade =
Page 37 and 38: Arrangement 1 & 9, SWSI Rotatable,
Page 39 and 40: ARRANGEMENTS 1 & 9ARR. 1ONLYArrange
Page 41 and 42: Arrangement 1 & 9, SWSI Non-Rotatab
Page 43 and 44: Arrangement 1 & 9, SWSI Non-Rotatab
Page 45 and 46: Arrangement 3, SWSI Non-Rotatable,
Page 47 and 48: Arrangement 3, DWDI Non-Rotatable,
Page 49 and 50: Arrangement 3, DWDI Non-Rotatable,
Page 51 and 52: DWDIFans shall be Model BAE Airfoil

BAE - SWSI & DWDI Airfoil Fans - Twin City Fan & Blower

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