Type K ExhaustersDesigned to Meet the Exacting Standardsof Industrial Service

Better Air is Our Business®

The AAF Type K Exhauster was developed to meet the severerequirements – high static pressures, heavy dust concentrations,and frequently, highly corrosive conditions – encountered in theapplication of AAF dust control equipment.

Type K Exhausters

Designed to Meet the Exacting Standardsof Industrial Service

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Design Advantages1. High EfficiencyMaintained over a wide range of operations, a highly desirablefeature on local exhaust systems subject to wide variations in staticpressures.

2. Split Taper HubInsures reduced maintenance cost on these heavy dutyapplications where periodic wheel replacement is anticipated.

3. New Impeller designGreatly reduces susceptibility to dynamic unbalance. The narrowAAF Type K Impeller reduces the lever length through whichunbalance, caused by material accumulations, can act.

4. Heavy Duty Shaft and BearingsInsure longer unit life. Narrow wheel design also increaseseffectiveness of shaft and bearings by reducing length of wheeloverhang.

5. Quick Opening Access DoorsAllow fast and easy access for cleaning and inspection.

6. Completely RotatableIn 45° increments of discharge positions in the field.

7. Completely ReversibleIn the field to allow either clockwise or counter clockwise rotation.

Flexibility offered by Items (6) and (7) means the AAF Type KExhauster is never obsolete.

Narrow Wheel Design

New thinking in industrial exhausterdesign is presented by the Type KExhauster. AAF researchengineers have always recognizedthat the narrower an exhausterwheel could be made, the less itwould be affected by unbalancecaused by material accumulation.It is also recognized that a narrowwheel design greatly increased theeffectiveness of shafts andbearings by reducing the distancefrom the outer wheel peripheryto the fixed point (bearing).Reduction of this distanceproportionately decreases theforce acting on the shaft andbearings allowing greater wheelloads to be handled.

Efficient and rugged Type K Exhausterwheels are designed for years of troublefree operation.

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CapacitiesType K Exhausters are available in fourteen sizes ranging from 7-inchto 42-inch inlet diameter. Corresponding wheel diameters range from12.0" to 69".

Available capacities range from 300 to 52,000 CFM at static pressuresto 16 inches of water (and higher where tip speed allows ).

ArrangementsStandard AMCAArrangements 1 and 9 are available. Arrangement 1is predominantly used for the usual industrial exhaust system.Arrangement 9 should be considered where space is at a premium.

Type K Exhauster,Arrangement 1.

Type K Exhauster, Arrangement 9 Isrecommended where space is at a premium.

Shaft Assembly

Construction FeaturesHousing ConstructionHeavy gage all-welded housingswith unique winged rib design,used for many years in AAFType W RotoClones, have beenincorporated in the Type KExhauster. This designreinforces the exhauster backplate to eliminate housingdeflection and distortion underhigh operating pressures.

Split Taper HubThe split taper hub puts an endto impellers freezing to shafts.The same principle isincorporated in this hub designas is used on split taper hubs forV-belt drives. This hub designhas proved its merit inthousands of installations of AAFexhaust equipment operatingunder the most severe conditionsof corrosion, abrasion, andtemperature. This in an exclusivefeature of the Type K Exhauster.

BearingsHeavy duty ball or spherical rollergrease bearings are standard onType K Exhausters. Bearingshave been selected for extra

long life under the most severeoperating conditions. Bearingsare self-aligning with provisionsfor expansion included. Otherbearing types can be furnished tomeet special operating conditionswhere required.

High Temperature UnitsType K Exhausters of standardconstruction are suitable foroperation with air temperaturesup to 400°F. For temperaturesbetween 400°F and 500°F, unitswill be provided with shaftcoolers and grease lubricatedbearings. From 500°F to 700°F,units will be provided with shaftcoolers and static oil lubricatedbearings. For temperatures inexcess of 700°F, consult yournearest AAF field office foradditional information.

Shaft

Front BearingAssembly

ScrollBack Sheet

Split TaperBushing

Split Taper Hub

Disc Plate

Key

Hub Cap

Set Screws

10300 Ormsby Park Place Suite 600Louisville, Kentucky 40223-6169

www.aafintl.comCustomer Service 800.477.1214Fax 800.254.3019

Type K Exhausters

Special ConstructionCorrosion Resistant CoatingsCan be furnished when required.

Special Alloy SteelsType K Exhausters can beconstructed of stainless steel,AR steel, or other special alloys.

Spark Resistant ConstructionAMCA C construction isavailable to meet applicationsinvolving explosion hazards.

High Temperature and Altitude Fan SelectionThe Type K Exhauster capacity table and charts are based upon theexhauster handling standard air at 70°F. 29.92" barometric pressureat 0.075 pounds per cubic foot. For any operating conditions otherthan standard, it is necessary to correct the horsepower requirementsof the exhauster, adjust the RPM for its different density, and checkthe impeller RPM derating limits.

AccessoriesHousing DrainsFan housing drains should be included in all exhausters wheremoisture may condense and accumulate at the low point in the fanhousing or where rain may enter the fan discharge during shutdown.

Flanged Inlet & OutletFlanges for both the fan inlet and outlet can be furnished, on all Type KExhausters, to make fan installation easier. Ductwork can be installedprior to receiving the fan, since no sleeve connections are required.

Cooling DiscA cooling disc is recommended to protect bearings between 400°Fand 700°F. Consult your nearest AAF field office to obtain informationon the type of special construction required for temperatures inexcess of 700°F.

Shaft SealAir leakage around the fan shaft is prevented by incorporating a shaft seal.Shaft seals are available for both high and low temperature applications.

Safe Speed Deration for Temperature

Temperature Standard Temperature Standard°F Wheel °F Wheel

–50 1.00 400 .86

70 1.00 500 .82

100 1.00 600 .79

200 .94 650 .78

300 .90 700 .76

AAF has a policy of continuous product research andimprovement and reserves the right to change

design and specifications without notice.

ISO Certified 9001:2000

©2008 AAF InternationalThe USGBC Member logo is a trademark owned by theU.S. Green Building Council and is used by permission.APC-1-513G NOV ‘08 VI 2M