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FB SERIESLarge Ceramic Fiber 2200°F Electric Box FurnacesAPPLICATIONSThe FB Series Electric Box Furnaces are largegeneral purpose ceramic fiber lined furnaces.They achieve high precision by featuringhighly accurate digital controls, mercurycontactors for fast cycle times, two zonecontrol (top and bottom) and even spacing ofelements. They reach temperatures up to2200°F (1200°C) with 2600°F (1425°C) fiberand up to 2000°F (1095°C) with 2300°F(1260°C) fiber. Insulation is all ceramic fiberexcept for hearth and hearth support. Theyare available is standard sizes up to eight feetcubed and even larger in custom sizes.This is a custom size FB 4410which is 4 feet wide by 4 feet highby 10 feet deep. It includes bottomelements and a pneumatic verticaldoor. Bottom elements are unusualin these big furnaces but can beuseful for uniformity and/or addingmore KW to the system.FEATURESHIGH TEMPERATURE UNIFORMITYThe furnace is uniform to within +/-25°F(+/-14°C) above 1500°F (815°C). Optionaltop mounted recirculating fans and multizonepower controls are available foruniformity of up to +/-10°F (+/-5.5°C).EVEN ELEMENT PLACEMENTEach element is separately and evenly spacedon the bottom, sides, door and back in rowsof ceramic holders. This is the finest method ofdistributing radiant heat energy at hightemperatures and is unique to L&L furnaces.ZONE CONTROL FOR HIGH UNIFORMITYThe elements are divided into top andbottom zones. The control output is routedthrough two input switches to allowadjustment of the total time on to each zone.There are thermocouples mounted top andbottom with a selector switch to read thedifferential. Special designs with up to sixzones or more can be used to promote evengreater temperature uniformity.CERAMIC ELEMENT HOLDERSThe elements are supported in proprietaryceramic element holders. These provideperfect support for the coiled elements aswell as excellent radiating characteristics. Thesmooth surface prevents premature failure ofthe element as it expands and contracts. Theholders are kept in place on the insulationwalls with specially designed ceramic clampsand screws. These fasten to a stainless steelmesh screen which is an integral part of theinsulation modules. See web site for details.CERAMIC FIBER INSULATION FEATURESFAST HEAT UP AND COOL DOWNThe sides of the furnace are insulated with 8”of low density ceramic fiber and mineral woolboard. The top is insulated with 10 pounddensity 8” ceramic fiber modules.Page 12HEARTHS AND LOADING SYSTEMSThe hearth is typically insulated with ceramicfiber, firebrick sections or light weight buttough insulating castable refractory slabs. Thestandard hearth is a flat castable floor.Castable piers for forklift loading areoptional. An option for a convenient loadingsystem is a serpentine alloy hearth tray whichis loaded into the furnace with a hydraulicallyoperated loader (see page 13). Other hearthssuch as alloy rollers are available.DOOR AND SEALThe door seal is a folded pad of ceramic fiberblanket which seals against a rigid ceramicfiber board attached to the case front. Thestandard furnace door is horizontally openingwith a double-pivoted hinge which allowsparallelogram opening of the door. This keepsthe hot face of the door away from theoperator and allows tight sealing of the door.Four hand wheels clamp the door tightlyagainst the front seal. Pneumatic or electricallyoperated vertical doors are optional (theseare particularly useful when loading andunloading the furnace hot).DIGITAL PID CONTROL AND HIGH LIMITStandard controls include a Honeywell UDC2300 digital control and separate high limitback up control. Mercury contactors arestandard; SCR power controls optional.OPTIONS● NEMA 12 PANEL OPTION: Includes a fuseddisconnect switch.● RAMP/SOAK PROGRAM CONTROLS● TEMPERATURE RECORDERS● SCR POWER CONTROLS● MULTI-ZONE CONTROL: with a UMC800.● HIGH TEMPERATURE FANS● ATMOSPHERE CONTROL● POWERED VENTURI FOR COOLING● PNEUMATIC VERTICAL DOOR● LOADERS: See pages 3, 9 & 13.● HEAT SHIELD: For 120°F (20°C) case temperatures.● BOTTOM ELEMENTS● ALSO SEE XLE OPTIONS: See page 9www.hotfurnace.com
FB SPECIFICATIONSMODEL WORK DIMENSIONS INSIDE DIMENSIONS OUTSIDE DIMENSIONS WORK LOAD SHIPNUMBER W H D W H D W H D CU FEET KW WEIGHT WEIGHTFB 333 36 36 36 42 42 42 84 88 69 27 64 675 4200FB 334 36 36 48 42 42 54 84 88 81 36 76 900 4900FB 336 36 36 72 42 42 78 84 88 105 54 100 1350 6300FB 444 48 48 48 54 54 54 96 100 81 64 105 1200 5900FB 446 48 48 72 54 54 78 104 92 102 96 136 1800 7300FB 555 60 60 60 66 66 66 116 104 90 125 157 1875 7700FB 666 72 72 72 78 78 78 128 116 102 216 219 2700 10000FB 888 96 96 96 102 102 102 152 140 126 512 375 4800 15800Dimension are in inches (except for Working Cubic Feet). Weight is in pounds. Standard voltages supplied are 480, 240, 208, 380 and 575. Three phase or single phaseis available. Special sizes are commonly made - the above sizes are only representative. Heavier load weights are possible. Outside dimensions are for a horizontal doorand include the side mounted control panel. Fans reduce inside working height by 12”.FN SERIESAtmosphere Box Furnaces with Certifiable Uniformity of ± 5°F from 300°F to 2200°FAPPLICATIONSThe FN Series Ultra Uniform Electric BoxFurnaces feature extremely uniform temperaturegradients over a wide temperature range.The other essential feature is very tightatmosphere construction. Uniform distributionof elements, fan circulation of furnaceatmosphere, ceramic fiber insulation, six ormore zones of element control, SCR powercontrol, generous extra area inside the furnaceto keep direct radiation of elements at aminimum and a very tight gasketed andinterlocked door seal make the FN Seriesunique. Atmospheres may be air, inert orcombustible. The uniformity specification isguaranteed from 300°F (150°C) to themaximum temperature of the furnace. Themaximum temperature rating depends on thetype of fan used, type of elements and grade ofinsulation. Three temperature ranges areoffered: 1800°F (980°C), 2000°F (1095°C), and2200°F (1200°C).These furnaces are ideal foraviation work or any critical heat treating thatrequires certifiable uniformity. The designdetails are carefully thought out for convenienceof use, service and flexibility.FN SPECIFICATIONSFEATURESINSULATION & ELEMENTS LIKE FB SERIESHEAVY DUTY ATMOSPHERE TIGHT CASEEVENLY DISTRIBUTED ALLOY ELEMENTSSIX ZONES OR MORE OF CONTROLThe element circuits are broken into six ormore separate zones. +/-5°F (+/-2.8°C) modelsare controlled with six separate SCR powercontrols with a UMC800 multi-loop control.CIRCULATING FANSOne or more fans circulate the furnaceatmosphere and promote uniformity.ELECTRIC VERTICAL DOOR WITH FOURPOWERFUL PNEUMATIC CLAMPSThe standard door is a counterbalancedvertical door driven by an electric brakemotor. When the door is in the full downposition, four powerful pneumatic clamps pullthe door horizontally closed tight against thetwo independent gasket seals and into theheat interlock.The main gasket is a wide padof ceramic fiber. This is augmented by atadpole gasket and a precision interlockinghard fiber plug that protrudes from the doorinto a matching notch in the furnace case seal.This is anFN 545with aloader andserpentinehearth.The photo on the frontcover is an FN Series furnace.This three way seal ensures both theatmosphere and heat seal. Silicone rubberseals are also available for even tighteratmosphere control.WORK INSIDE OUTSIDE MAXMODEL DIMENSIONS DIMENSIONS DIMENSIONS STANDARD HIGH LOAD SHIPNUMBER W H D IW IH ID OW OH OD KW KW WEIGHT WEIGHTFN 222 24 24 24 36 48 36 72 185 65 40 60 400 5,500FN 223 24 24 36 36 48 48 72 185 77 55 80 600 6,000FN 324 36 24 48 48 48 60 84 185 89 90 125 1200 7,500FN 326 36 24 72 48 48 84 84 185 113 125 175 1800 9,000FN 434 48 36 48 60 60 60 96 226 89 120 165 1600 9,000FN 436 48 36 72 60 60 84 96 226 113 150 225 2400 10,000FN 545 60 48 60 72 72 72 108 238 101 155 225 2500 10,000FN 546 60 48 72 72 72 84 108 238 113 180 265 3000 11,000FN 555 60 60 60 72 84 72 108 240 101 160 225 2500 11,000FN 646 72 48 72 84 72 84 120 240 113 225 300 3600 13,000FN 666 72 72 72 84 96 84 120 240 113 240 315 3600 15,000Dimensions are in inches. Weight is in pounds. Add another 30” to width for control panel and 30” for atmosphere panel. Hearth height is typically 42”. Special sizesare available. Standard voltages supplied are 480, 240, 208, 380 and 575. Three phase or single phase is available. Higher KW is available. Special sizes are available.800.459.0750Page 13
Page 1 and 2: FURNACES • OVENS • KILNS • QU
Page 3 and 4: OPTIONSA Wide Range of Options Cust
Page 5 and 6: GS 17142350°F Laboratory, Glass &
Page 7 and 8: XLE SERIESFirebrick Lined 2350°F E
Page 9 and 10: XLE OPTIONS● VERTICAL DOORS: Pneu
Page 11: QDS SERIESSmall Premium Dual Chambe
Page 15 and 16: XLC SPECIFICATIONSINSIDEOUTSIDEMODE
Page 17 and 18: TB & TBU SERIESCeramic Fiber Lined
Page 19 and 20: XLG OPTIONS● BLOWER FILTERS● RA
Page 21 and 22: DV & DR OPTIONS● 1400°F (760°C)
Page 23 and 24: GF SERIES2800°F Silicon Carbide El
Page 25 and 26: GHH SPECIFICATIONSWORK INSIDE CHAMB
Page 27 and 28: FC SPECIFICATIONSACTUAL APPROX TYPI
Page 29 and 30: QT SERIESAgitated and Heated Heavy-
Page 31 and 32: JDR SERIESTop Loading Controlled At

ovens • kilns • quench tanks furnaces • ovens • kilns • quench tanks

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