industrial ventilation systems
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Thiscourseisadaptedfromt
heUnifiedFacilitiesCriteriao
ftheUnitedStatesgovernment,
whichisinthepublicdomain,
hasunlimiteddistributionandisnotcopyrighted.
J.
PaulGuyer2009
2
CONTENTS
1.INTRODUCTION
1.1GENERALCRITE
RIA
1.2DESIGNPROCED
URE
1.3DESIGNCRITERIA
1.4CONTROLS
1.5OPERATIONALC
ONSIDERATIONS
1.6COMMISSIONING
2.WOODSHOPFAC
ILITIES
2.1FUNCTION
2.2OPERATIONALC
ONSIDERATIONS
2.3FLOORPLANLAYOUT
2.4DESIGNCRITERIA
2.5SAFETYANDHE
ALTHCONSIDERATIONS
3.PAINTSPRAYBO
OTHS
3.1FUNCTION
3.2OPERATIONALC
ONSIDERATIONS
3.3DESIGNCRITERIA
3.4FANSANDMOTO
RS
3.5REPLACEMENTAIR
3.6SYSTEMCONTR
OLS
3.7RESPIRATORYP
ROTECTION
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runn
ing,
istheoffsetstackdesignC,asshow
ninFigure1-1.
Watermaystill
ente
rthesystemwithstraightstackdesignA.P
rovideameanstodrainwater
from
thefanhousing.
Loc
ationandStructuralConsiderations.
RefertoASHRAE(AmericanSociety
ofH
eating,
RefrigerationandAirConditioningE
ngineers)Handbook,
Fun
damentalsforinformationonairflowaround
buildings.
Donotselectstack
loca
tionsbasedonprevailingwinds.Astackm
ustprovideeffluentdispersion
underallwindconditions.RefertoUFC1-200-01,
Design:GeneralRequirements
fore
xhauststackstructuraldesignconsideratio
ns.
Somestructural
considerationsarewindload,
lightningprotection,andstacksupport.
Referto
and
SMACNAGSSDC,
GuideforSteelStackD
esignandConstructionfor
additionalinformation.
1.3.3AirP
ollutionControlEquipment.Requirementsforairpollutionequipmentvary
byprocess
andgeographicalregionintheUnitedStates.Contactthelocal
environmentalmanagertodeterminethepollutioncon
trolrequirementsfortheprocess.
1.3.4ReplacementAir.
Replacementairisasimportantasexhaustairincontrolling
industrialp
rocesscontaminants.
Properlydesignedre
placementairwill(1)ensurethat
exhaustho
odshaveenoughairtooperateproperly,(2)helptoeliminatecross-drafts
throughwindowanddoors,
(3)ensureproperoperatio
nofnaturaldraftstacks,
(4)
eliminatec
olddraftsonworkers,and(5)eliminateexc
essivedifferentialpressureon
doorsand
adjoiningspaces.Themethodofdistributin
greplacementairandthequantity
ofreplacem
entairarecriticalwithrespecttoexhaustair.
Designthereplacementair
systeminaccordancewiththedecisiontreeshownin
Figure1-2.
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ExhaustStackDesigns
Figure1-1
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DecisionTreeforReplacemen
tAirDesign
Figure1-2
1.3.3.1SpacePressureModulation.
Controltheven
tilatedspacepressureby
modulating
thequantityofreplacementair.
Useavariablefrequencydrive(VFD)motor
tocontrolthefanspeed.
Usingbarometricdamperstocontrolreplacementairquantity
isinefficien
tandunreliable.
Sensorcontrolledtransfergrillesareacceptableprovided
therewilln
otbeaproblemwithcontaminatedmigratio
n.
1.3.3.2Ple
numDesign.
Useperforatedplatetocove
rasmuchoftheceiling(orwall
oppositeth
eexhausthood(s))aspractical.Thediame
teroftheperforationshouldbe
between1/4inand3/8in.
Perforatedplenumsworkb
estwhenceilingheightisless
than15ft.
Useeitherofthefollowingtwochoicesforreplacementairplenumdesign:
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Designfor1,00
0fpmreplacementairvelocitythroughthe
openareaofthe
perforatedplateifperforatedductisusedinsidetheplenu
masshowninFigure
1-3.
PlenumDesignwithPerforatedDuct
Figure1-3
Designfor2,00
0fpmreplacementairvelocitythroughthe
openareaofthe
perforatedplateiftheplenumisservedwithductsusingd
iffusers,grillsor
registersasshowninFigure1-4.
PlenumDesignwithoutPerforatedDuct
Figure1-4
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NOTES:
1.
Sizeeac
hplenumtake-offfornomorethan8ftofple
numwidth.
Sizetheexhaust
plenumfor
amaximumplenumvelocityof1,0
00fpm.Sizereplacementairplenumfora
maximump
lenumvelocityof500fpm.
2.
Perforatedplatewith3/8-inholes.
Sizeopenareafor
anairflowvelocityof2,0
00fpm
throughholes.
Drive-throughcrossdraftpaintboothwithm
echanicalreplacementair.
Figure3-2
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NOTES:
1.
Sizeeachplenumtake-offfornomorethan8ftofplenumwidth.
Sizetheexhaust
plenumforamaximumplenumvelocityof1,0
00fpm.
Sizereplac
ementairplenumfora
maximumplenumvelocityof500fpm.
2.
Perforatedplatewith3/8-inholes.
Sizeopenareaforanairflowvelocityof2,0
00fpm
throughholes.
Drive-through
crossdraftpaintboothwithnoMechanica
lreplacementair
Figure3-3
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3.5.2HeatingandAirConditioning.
Mostnewpain
tsprayboothventilationsystems
haveapaintingmodeandacuringmode.
Donotre-circulateairduringthepainting
mode.
Abo
ut10percentoftheboothairflowisfromoutsidetheboothand90percentof
theexhaus
tairisrecycledduringcuring.
Reviewthep
aintdryingrequirementsbefore
specifying
temperatureandhumidityranges.Referto
ANSIZ9.7
forexhaustairre-
circulation
requirements.
3.6SYSTE
MCONTROLS.
Designsystemcontrolsina
ccordancewithparagraph1.4.
3.7RESPIRATORYPROTECTION.
Seeparagraph1.5
.6.
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