Radial Tip Fans - Catalog 980 - Twin City Fan & Blower

Optional ConstructionHigh Temperature Construction301 to 500°F: Requires addition of shaft cooler andhigh temperature grease bearings.501 to 600°F: Above modifications plus high temperaturealuminum paint.601 to 800°F: Above plus modified pedestal design.Special Width & Diameter ConstructionVariations in wheel widths (50% to 105%) and wheeldiameters (98% to 102%) are available to matchdesigned performance at motor speeds for the greatestefficiency for any given application.Abrasion and Corrosion ResistantAlloys & CoatingsOptional construction includes an abrasion resistantsteel blade and backplate. Construction materialsinclude Corten, stainless steel, Monel, aluminum,Hastelloy and other alloys. Special corrosion resistantcoatings of various types are available.Scroll Liners7-gauge AR steel material welded in place. Boltedliners are not recommended. Liners are made out ofT-1 steel. Hard surface overlay type as manufacturedby Tapco or Chamfer available on request.Side (Cheek) LinersCovers approximately 25% of the housing sides.Made of 7 gauge AR steel and welded to housingsides.ArrangementsArrangement 1The usual choice for manyV-belt drive applications.Wheel is overhung. Steelbearing pedestal. Checkwith the factory for V-beltdrive applications largerthan 300 HP.Arrangement 9FFloor mount. Similar to Arrangement 1 with the fanbase extended to mount motor in a horizontal position.Arrangement 3 SISWSI fan with integral inletbox and independent bearingpedestals. The wheelis supported between twobearings.Heavier Gauge ConstructionHeavier than standard gauge construction is available,consult factory.Spark Resistant ConstructionFan applications may involve the handling of potentiallyexplosive or flammable particles, fumes or vapors.Such applications require careful consideration by thesystem designer to insure the safe handling of suchgases. Twin City Fan & Blower offers the followingclassifications of spark resistant construction perAMCA Standard 99-0401-86. It is the specifier or theuser’s responsibility to specify the type of spark resistantconstruction with full recognition of the potentialhazards and the degree of protection required.Type A Consult factory for construction details.Type B Consult factory for construction details.Type C The fan shall be so constructed that theshift of the wheel or shaft will not permittwo ferrous parts of the fan to rub or strike.This is accomplished with an aluminuminlet cone and rub ring. This construction islimited to 500°F. Construction to 800°F isavailable using a steel inlet cone with copper/bronzelining.Notes:1. Bearings shall be placed outside the airstream.Therefore, do not use Arrangement 3 or 7.2. The user shall electrically ground all fan parts.Refer to the above listed AMCA standard for fulldetails.Arrangement 7 SIDirect coupled witha flexible coupling. Asingle-width, singleinletfan with anintegral inlet box andindependent bearingpedestal and bearing/motorpedestalinstalled on a commonbase. The wheelis supported betweentwo bearings.Arrangement 8Direct coupled with a flexiblecoupling. The motorpedestal can be customfabricated out of steel.6 Twin City Bulletin 980