Goodman GMH8 Technical Information
Contents
1. AR CLEANER d C AR EAC ND 9 RO2 ROLLOUT fixe K3 K6 ROL 1 SW TCH io K7 XEMR LINE HOT acr 120 VAC TES VAC uL J UPER COL R FACTORY Y 2 UNPER b G Gl o GN GND M MV PS 2 au THERMOSTAT CENSOR 9 PROBE J gm 20 GN TOR 3 en MT DIMT STAGE its e chs PRESSURE SW TCH TYPICAL SCHEMATIC GMH8 MODEL FURNACES WR 50M56 289 INTEGRATED IGNITION CONTROL This schematic is for reference only Not all wiring is as shown above Always refer to the appropriate wiring diagram for the unit being serviced 172. gt m SNR BURNERCOMPARTMENT JUNCTIONBOX gt Eee 24 DOOR peg lt O DOCHSWITGH HUMIDIFIER SWITCH NES Lyri o SWITCHLOCATEDINBLOWER Q COMPARTMENTONSOMEMODELS e d i fr ul 8 A WARNING DISCONNECTPOWER i 9 o gt zz M T YL BEFORESERVICING TE PRIMARYLIMIT WIRINGTOUNIT RD MUSTBE vi iu PROPERLY wo amp POLARIZED yoo wa ANDGROUNDED Y m tr BK L GND N Q a BR 9 BL OVERCURRENTPROTECTIONDEVICE W u a PM C HI JUNCTION Orco mE 1 3 2 BOX Wy EUG SURFACE 25 1 LINEN 234 25 lt IGNITER GASVALVE GND HONEYWELL e gt 2 PU 4 I 8 INDUCEDDRAFT BLOWER TO115VAC 1 60HZ 020 PU 241 PU POWERSUPPLYWITH TaD a FLAME OVERCURRENTPROTECTION SENSOR DEVICE ROLLOUTLIMITS SINGLECONTROLONSOMEMODELS 40 STEADYON NORMALOPERATION 2 OFF CONTROLFAILURE LOWVORIAGE AN mm EQUIPMENTGND 7 gt 1FLASH SYSTEMLOCKOUT RETRIES RECYCLESEXCEEDED LOWVOLTAGEFIELD FIELDGND 2FLASHES PRESSURESWITCHSTUCKCLOSED HIVOLTAGE 115V x 3FLASHES PRESSURESWITCHSTUCKOPEN an BIEFUSELICE dj HIVOLTAGEFIELD 4FLASHES OPENHIGHLIMIT SWITCH TEMP aj JUNCTION BT 6 SFLASHES FLAMESENSEWITHOUTGASVALVE HS TERMINAL IGNITER 6 6FLASHES OPENROLLOUTOROPENFUSE 7 7FLASHES LOWFLAMESIGNAL Nr AJERN
3. WARNING DISCONNECTPOWERBEFORE justesse eee HUMIDIFIER 4 INTEGRATED SERVICING WIRINGTOUNITMUSTBE iL laca CONTROLMODULE PROPERLYPOLARIZEDANDGROUNDED TXFUR S 1 24 Ne HUMIDIFIER i MOSS pH VAVE A MVH 12 4 4 1 MVL AUXILIARY 3 LIMITCONTROLS SWITCH VEM EUM sA O Psio NO Me Br FOE ke E Psom rn 1505 1008 8 Jog 51 MICRO HLI 7 a WH 2 W QO BL E OOO 8 AUTORESET AOA 0 iib 26 1 PRIMARY SEENOTEG 99 RO2 11 LIMIT 3 AUXILIARY 3 CONTROL LIMITS z ROIG INTEGRATED CONTROLMODULE MANUALRESETROLLOUT LIMITCONTROL S gt T SINGLECONTROLONSOMEMODELS FS 5 XFMR 3 T j Coad 40VA 88 BL BR TRANSFORMER 1 RD 8 Y Y XFMR H 115VAC XFMR N 8 FLAMESENSOR Z iG 5 FP 2 2 HOTSURFACE IGNITER XFMR H EAC H IGN IGNN E 2 1 9 2 SEE z 5 o 258 o TOO 9582 ID m 330 IND 8 8 INDN 9 8 2 5 gt 24V 8 E 4aoic LAI 3 d gt 9 H CIRCULATOR 8 L 2 115V P 25 1 z RY BLWR CIRN XFMR 29 Bo U 5 gt E 2 25 a WH oc 5 ul 8 dh 18PINPLUG EACH orc ONSOMEMODELS 5 BLOWERCOMPARTMENT 2 UINEH UNEN
4. 1177 TECHNICAL MANUAL 33 3 8 80 Gas Furnace 80 AFUE 2 Stage Convertible Multi Speed Upflow Horizontal Refer to Service Manual RS6612007 for troubleshooting information e All safety information must be followed as provided in the Service Manual e Refer to the appropriate Parts Catalog for part number information Model numbers listed on page 3 Intertek This manual is to be used by qualified professionally trained HVAC technicians only Goodman does not assume any responsibility for property damage or personal injury due to improper service procedures or services performed by an unqualified person RT6621024r4 November 2013 Copyright 2011 2013 Goodman Manufacturing Company L P PRODUCT IDENTIFICATION The model and manufacturing number are used for positive identification of component parts used in manufacturing Please use these numbers when requesting service or parts information FEATURES MINOR REVISION N Natural Gas A Initial Release NOMINAL CAPACITY 040 40 000 BTUH B 17 1 2 D 24 1 2 060 60 000 BTUH 080 80 000 BTUH 100 100 000 BTUH 120 120 000 BTUH 140 140 000 BTUH MAJOR REVISION A Initial Release HIGH VOLTAGE 48 WARNING Disconnect ALL power before servicing or installing this unit Multiple power sources may be present Failure to do so may cause property damage personal injury or death Goodman will not be responsible d WA
5. LP BTUH A F U E 40 000 32 000 32 000 80 0 60 000 48 000 48 000 80 0 60 000 48 000 48 000 80 0 80 000 64 000 64 000 80 0 80 000 64 000 64 000 80 0 Rated External Static w c Temperature Rise F Pressure Switch Trip Point w c Blower Wheel D x W Blower Horsepower Blower Speeds Q 0 5 E S P 0 20 0 50 25 55 0 70 10x6 1 3 4 1298 0 20 0 50 20 50 0 75 10x6 1 3 4 1157 0 20 0 50 20 50 0 75 10x8 12 4 1883 0 20 0 50 35 65 0 70 10x8 1 3 4 1448 0 20 0 50 35 65 0 70 10 8 1 2 4 1725 Power Supply Volts Hz Ph Minimum Circuit Ampacity MCA 5 Maximum Overcurrent Device 2 Transformer VA 115 60 1 8 1 15 40 115 60 1 8 1 15 40 115 60 1 12 5 15 40 115 60 1 8 1 15 40 115 60 1 12 5 15 40 Primary Limit Setting F Auxiliary Limit Setting F Rollout Limit Setting F Fan Delay On Heating Off Heating Fan Delay On Cooling Off Cooling Fan Delay On Fan Only Gas Supply Pressure Natural Propane w c Manifold Pressure Natural Propane w c Orifice Size Natural Propane Number of Burners Vent Connector Diameter inches Shipping Weight Ibs Low NOx model available 1 Thesefurnaces are manufactured for natural gas operation Optional kits are available for conversion to propane operation 2 Minimum Circuit Ampacity cal
6. allowing in some in stances common venting with natural draft appliances i e water heaters All installations must be vented in accordance with National Fuel Gas Code NFPA 54 ANSI Z223 1 latest edition In Canada the furnaces must be vented in accordance with the National Standard of Canada CAN CSA B149 1 and CAN CSA B149 2 lat est editions and amendments NOTE The vertical height of the Category venting system must be at least as great as the horizontal length of the venting system 2 Line voltage wiring can enter through the right or left side of the furnace Low voltage wiring can enter through the right or left side of furnace 3 Conversion kits for propane gas and high altitude natu ral and propane gas operation are available See High Altitude Derate chart for details 4 Installer must supply the following gas line fittings de pending on which entrance is used Left Two 90 Elbows one close nipple straight pipe Right Straight pipe to reach gas valve PRODUCT DESIGN Accessibility Clearances Minimum Unobstructed front clearance of 24 for servicing is rec ommended MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS INCHES sw B 24 clearance for serviceability recommended Single Wall Vent SW to be used only as a conncetor Refer to the venting tables outlined in the Installation Manual for additio
7. 0 6 w c to 0 8 w c is shown for air conditioning purposes only The dashed areas indicate a temperature rise not recommended for this model At higher altitudes a properly derated uni will have approximately the same temperature rise at a particular CFM while the ESP at that CFM will be lower BLOWER PERFORMANCE SPECIFICATIONS BTU OUTPUT vs TEMPERATURE RISE CHART FORMULAS CFM x 1 08 x RISE BTU OUTPUT BTU OUTPUT 600 CFM 100 O O N O co LO 1 10 40 50 60 70 80 90 100 110 120 130 140 150 30 OUTPUT BTU HR x 1000 WIRING DIAGRAMS GMH8
8. 4 1960 1 2 4 1974 3 4 4 2131 3 4 4 2131 Power Supply Volts Hz Ph Minimum Circuit Ampacity MCA 2 Maximum Overcurrent Device Transformer VA 115 60 1 12 5 15 40 115 60 1 12 5 15 40 115 6071 14 7 15 40 115 60 1 14 7 15 40 Primary Limit Setting F Auxiliary Limit Setting F Rollout Limit Setting F Fan Delay On Heating Off Heating Fan Delay On Cooling Off Cooling Fan Delay On Fan Only Gas Supply Pressure Natural Propane w c Manifold Pressure Natural Propane w c Orifice Size Natural Propane Number of Burners Vent Connector Diameter inches Shipping Weight Ibs Low NOx model available GMH8 BB GMM81405DNCC These furnaces are manufactured for natural gas operation Optional kits are available for conversion to propane operation Minimum Circuit Ampacity calculated as 1 25 x Circulator Blower Amps 1 0 Blower Amps Wire sizes should be determined in accordance with Maximum Overcurrent protections Device refers to maximumrecommended fuse or circult breaker size May use time delay fuses or HACR type For elevations above 2000 feet the rating should be reduced by 4 for each 1000 feet above sea level The furnace must not be derated orifice 2 National Electrical Codes Extensive wire runs will require larger wire sizes 3 circuit breakers of the same sizes as noted NOTES 1 changes should only be
9. ALTO um SWITCH PRESS oe 8FLASHES CHECKIGNITERORIMPROPERGROUND G CONTRO PAGT DEVICE PLUGCONNECTION 1 ICE RAPIDFLASHES REVERSED115VACPOLARITY VERIFYGND NOTES 1 SETHEATANTICIPATORONROOMTHERMOSTATATO 7AMPS COLORCODES 2 MANUFACTURE R SSPECIFIEDREPLACEMENTPART SMUSTBEUSEDWHENSERVICING YL YELLOW BRBROWN 3 IFANYOFTHEORIGINALWIREASSUP PLIEDWITHTHEFURNACEMUSTBE OR ORANGE WH WHITE REPLACED ITMUSTBEREPLACEDWITHWIRINGMATERIALHAVINGATEMPE RATURE PUPURPLE BLBLUE RATINGOFATLEAST105 C USECOPPERCONDUCTORSONLY RGAEEN 4 BLOWERSPEEDSSHOULDBEADJUSTEDBYINSTALLERTOMATCHTHEINSTALLATION GRG GYG REQUIREMENTSSOASTO PROVIDETHECORRE CTHEATINGTEMPERATURERISEANDTHE BKBLACK RD RED CORRECTCOOLINGCFM SEESPECSHEETFORAIRFLOWCHART 5 UNITMUSTBEPERMANENTLYGROUNDEDANDCONFORMTON E C ANDLOCALCODES 6 TORECALLTHELASTSFAULTS MOSTRECENTTOLEASTRE CENT DE PRESSSWITCH 0140F00662 REV A FORMORETHAN2SECONDSWHILEINSTANDB Y NOTHERMOSTATINPUTS Wiring is subject to change Always refer to the wiring diagram on the unit for the most up to date wiring 16 WIRING DIAGRAM WARNING DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT MULTIPLE POWER SOURCES MAY BE PRESENT FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE PERSONAL INJURY OR DEATH HIGH VOLTAGE RCULATOR BLOWER
10. GMH80803B BB B1370158 GMH80804B BB B1370158 For installaions Canada the GMH8 furnace is certified only to 4 500 ft Negative pressure readings are in inches of water column w c PRIMARY LIMIT Part Number 20162904 20162903 20162901 Open Setting F 150 160 210 ewewowe 31 awmxwsee 1 GMH80803B BB 1 ewewsce 1 Gwewece 1 ROLLOUT LIMIT SWITCHES AUXILIARY LIMIT SWITCHES PartNumber 10123529 Part Number 0130F00038 GMH80403 A 1 GMH80603 A GMH80604B 80803 1 PRODUCT DESIGN Coil Matches A large array of Goodman brand coils are available for use with the GDH8 furnaces in dedicated downflow applications These coils are available in both cased and uncased models with the option of a field installed TXV expansion device These 8096 furnaces match up with the existing Goodman brand coils as shown in the chart below Coil Matches Goodman units using R22 and R 410A EXPANSION REVISION TYPE F Flowrater C Indoor Coil REFRIGERANT CHARGE 6 R 410A or R 22 CABINET FINISH 2 R 22 U Unpainted 4 R 410a P Painted N Unpainted Case NOMINAL WIDTH FOR GAS FURNACE A Fits 14 Furnace Cabinet APPLICATION B Fits 17 1 2 Furnace Cabinet A Upflow Downflow Coil C Fits 21 Furnace Cabinet H Horizontal A Coil D Fits 24 1 2 Furnace Cabinet S Horizontal Slab Coil N Does Not Apply Horizon
11. RNING fo any injury or property damage 4 WARNING nstallation and repair of this unit arising trom improper service individuals meetin mga el A service procedures If you install or perform service on technician at a us specified m Air this unit yoH assume responsibility for any personal Heating and Refri eration Institute AHRI injury OF property damage which may result Many juris Attemptin inetall or re alr this unit without such dictions require a license to install or service heating and back duct d air conditioning equipment peers eee eer ern injury or death PRODUCT IDENTIFICATION The model and manufacturing number are used for positive identification of component parts used in manufacturing Please use these numbers when requesting service or parts information GMH80403A BB GMH81405DNCC GMH80603A BB GMH80604B BB GMH80803B BB GMH80804B BB GMH80805C BB GMH81005C BB GMH81205D BA Models available with Natural Gas and low NOx The United States Environmental Protection Agency EPA has issued various regulations regard A WARNING ing the introduction and disposal of refrigerants introduced into this unit Failure to follow these regulations may harm the environment and can lead to the imposition of substantial fines These regulations may vary by jurisdiction Should questions arise contact your local EPA office Do
12. culated as 1 25 x Circulator Blower Amps I D Blower Amps Wire sizes should be determined in accordance with National Electrical Codes Extensive wire runs will require larger wire sizes 3 Maximum Overcurrent protections Device refers to maximumrecommended fuse or circult breaker size May use time delay fuses or HACR type circuit breakers of the same sizes as noted NOTES 1 The total heat loss from the structure as expressed in TOTAL BTU HR must be calculated by the manufacturers method or in accordance with the A S H R A E GUIDE or MANUAL J LOAD CALCULATIONS published by the AIR CONDITIONING CONTRACTORS OF AMERICA The total heat loss calculated should be equal to or less than the heating capacity Output based on D O E test procedures steady state efficiency times output 12 FURNACE SPECIFICATIONS GMH80805C BB GMH81005C BB GMH81205D BA GMH81405DNCC Input Natural Gas BTUH Output Natural Gas BTUH Output LP BTUH A F U E 80 000 64 000 64 000 80 0 100 000 80 000 80 000 80 0 120 000 96 000 96 000 80 0 140 000 112 000 96 000 80 0 Rated External Static w c Temperature Rise F Pressure Switch Trip Point w c 0 20 0 50 35 65 0 75 0 20 0 50 35 65 0 70 0 20 0 50 40 70 0 80 0 20 0 50 40 70 0 80 Blower Wheel D x W 10x10 10x10 11X10 11X10 Blower Horsepower Blower Speeds Max CFM Q 0 5 E S P 1 2
13. e installed elsewhere in the duct system such as a central return MINIMUM FILTER SIZES for DISPOSABLE HLTERS 6 POM 100 120 140M DISPOSABLE NOMINAL 300 F M FACE VELOCITY 10 PRODUCT DESIGN Dual aver Configuration amp Operation Dual aver This furnace is capable of the following heating modes Single Stage Factory Setting Modified Two Stage Fixed 5 Min Low Stage Auto Time 1 12 Min Low Stage To change from the factor single stage operation adjust the dipswitches on the ignition control as follows HEAT OFF DELAY 1 STAGE SECOND 5 STAGE ONLY MINUTES Switches for White Rodgers board shown above With other venders order of switches may vary but functionality stays the same Note This furnace is designed to be used with a single stage thermostat Start Start Call for Heat Call for Heat Safety Circuit Check Safety Circuit Check Start Furnace Start Furnace in Low Stage in Low Stage Low Heat Blower Delay Time 5 Min Delay Time 1 12 Min j Gas Valve Switch to 2nd Stage to 2nd Stage Blower Switch to Blower Switch to Hi Heat Operation Hi Heat Operation T Stat Satisfied 11 FURNACE SPECIFICATIONS GMH80403A BB GMH80603A BB GMH80604B BB GMH80803B BB GMH8 BB GMH80804B BB Input Natural Gas BTUH Output Natural Gas BTUH Output
14. er 1 3 Integrated Control Module Tubular Heat Exchanger Pressure Switch Flue Pipe Connection Induced Draft Blower Gas Line Entrance Gas Valve Rollout Limit Junction Box 0 6 Gas Line Entrance Alternate 5 Circulator Blower Blower Door Interlock Switch 9 Wiring Harness Grommet 10 Gas Manifold 11 Inshot Burner 12 Transformer 13 Integrated Control Module 14 Blower Door Interlock Switch 15 Circulator Blower 16 Gas Line Entrance Alternate PRODUCT DIMENSIONS Alt Gas Inlet GMH8 7 High Voltage Inlet Low Voltage 23 3 4 28 33 UNITS GMH80403A GMH80603A GMH80604B GMH80803B GMH80804B GMH80805C GMH81005C All dimensions are in inches 3 8 1 7 16 23 5 16 Alt Gas Inlet Alt High Voltage Alt LowVoltage GMH8 BB PRODUCT DESIGN GMH81405DNCC PRESSURE SWITCH TRIP POINTS AND USAGE CHART TRIP POINT ID BLOWER ID BLOWER PRESSURE PRESSURE SWITCH SWITCH PART 80403 B1370158 GMH80603A BB B1370179 MODEL GMH80604B BB B1370179
15. made if necessary for altitude 2 The total heat loss from the structure as expressed in TOTAL BTU HR must be calculated by the manufacturers method or in accordance with the A S H R A E GUIDE or MANUAL J LOAD CALCULATIONS published by the AIR CONDITIONING CONTRACTORS OF AMERICA The total heat loss calculated should be equal to or less than the heating capacity Output based on D O E test procedures steady state efficiency times output 13 GMH8 BB BLOWER PERFORMANCE SPECIFICATIONS GMH81405DNCC a RON 14 CFM amp Temperature Rise vs External Static Pressure EXTERNAL STATIC PRESSURE Inches Water Column CFM RISE RISE MH80403A B MH80603A B MH80604B B MH80803B B MH80804B B MH80805C B MH81005C B MH81205D B GMH81405DNCC CFM in chart is without filters s Filters d All furnaces ship as high speed cooling not ship with this furnace but must be provided by the installer nstaller must adjust blower cooling speed as needed For most jobs about 400 CFM per ton when cooling is desirable INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE The chart is for information only For satis actory operation external static pressure must not exceed value shown on rating plate The shaded area indicates ranges in excess of maximum external static pressure allowed when heating The data for
16. nal venting requirements Note In all cases accessibility clearance shall take pre cedence over clearances from the enclosure where ac cessibility clearances are greater All dimensions are given in inches High Altitude Derate IMPORTANT NOTE The furnace as shipped requires no change to run between 0 5500 feet Do not attempt to increase the firing rate by changing orifices or increasing the manifold pressure below 5500 feet This can cause poor combustion and equipment failure High altitude installations above 5500 feet may require both a pressure switch and an orifice change These changes are necessary to compensate for the natural reduction in the density of both the gas fuel and the combustion air at higher altitude For installations above 5500 feet please refer to your dis tributor for required kit s Contact the distributor for a tabu lar listing of appropriate manufacturer s kits for propane gas and or high altitude installations The indicated kits must be used to insure safe and proper furnace operation All conver sions must be performed by a qualified installer or service agency COMPONENT IDENTIFICATION 2 Pressure Switch 3 Flue Pipe Connection 4 Induced Draft Blower Chimney Transition Top Shipped Loose 5 Gas Line Entrance 6 Gas Valve Rollout Limit Junction Box 9 Wiring Harness 0 Manifold 1 Inshot Burner 42 Transform
17. not connect or use any device WARNING i i ifi L Au o A WARNING that is not design certified by WARNING damage personal injury OF death Goodman for use with this unit do not store combustible materials or use gasoline or Serious property damage personal injury reduced unit other flammable liquids or vapors in the vicinity of this performance and or hazardous conditions may result appliance from the use of such non approved devices PRODUCT DESIGN General Operation The GMH8 furnaces are equipped with an electronic igni tion device used to light the burners and an induced draft blower to exhaust combustion products An interlock switch prevents furnace operation if the blower door is not in place Keep the blower access door in place except for inspection and maintenance This furnace is also equipped with a self diagnosing elec tronic control module In the event a furnace component is not operating properly the control module LED will flash on and off in a factory programmed sequence depending onthe problem encountered This light can be viewed through the observation window in the blower access door Refer to the Troubleshooting Chart for further explanation of the LED codes and Abnormal Operation Integrated Ignition Control section in the Service Instructions for an explana tion of the possible problem The rated heating capacity of the furnace should be greater than or equal to the total hea
18. t loss of the area to be heated The total heat loss should be calculated by an approved method or in accordance with ASHRAE Guide or Manual J Load Calculations published by the Air Conditioning Con tractors of America Obtain from American National Standards Institute 1430 Broadway New York NY 10018 Location Considerations furnace should be as centralized as is practical with respect to the air distribution system Do not install the furnace directly on carpeting or combustible material other than wood flooring When suspending the furnace from rafters or joists use 3 8 threaded rod and 2 x 2 x 3 8 angle as shown in the Installation and Service Instructions The length of the rod will depend on the application and clearance necessary When installed in a residential garage the furnace must be positioned so the burners and ignition source are located not less than 18 inches 457 mm above the floor and protected from physical damage by ve hicles To PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION THIS FURNACE MUST BE CATEGORY VENTED Do NOT VENT USING Catecory VENTING 1 Category Venting is venting at a non positive pres sure A furnace vented as Category is considered a fan assisted appliance and the vent system does not have to be gas tight NOTE Single stage gas fur naces with induced draft blowers draw products of com bustion through a heat exchanger
19. tal Slab Coils NOMINAL CAPACITY RANGE 13 SEER 1824 1 1 2to 2 Tons 3030 2 1 2 Tons 3636 3 Tons 3642 3 to 3 1 2 Tons 3743 3 to 3 1 2 Tons 4860 4 amp 5 Tons 4961 4 amp 5 Tons All CAPF coils amp D widths have insulated blank off plates for use with one size smaller furnaces All CAPF coils have a CAUF equivalent All CHPF coils in B C amp D heights have an insulated 2 bracket for use with one size smaller furnace All proper coil combinations are subject to being AHRI rated with a matched outdoor unit PRODUCT DESIGN Thermostats It is recommended that a single stage heat non power robbing thermostat be used Refer to the product marketing literature for a complete list of thermostats offered Filters Filters are required with this furnace and must be provided by the installer The filters used must comply with UL900 or CAN ULCS111 standards Installing this furnace without filters will void the unit warranty Upflow Filters This furnace has provisions for the installation of return air filters at the side and or bottom return The furnace will accommodate the following filter sizes depending on cabinet size Side Return s Bottom Return Cabinet Nominal Approx Cabinet Nominal Approx Width Filler Size Flow Area Width Filter Size Flow Area in in in in in in Refer to Minimum Filter Area tables to determine filter area requirement NOTE Filters can also b
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