Heatilator Wood Burning Fireplace A36C User manual

Heatilator•A36/42C,A36/42CH•InstallersManual•4017-262•RevD•10/07/13 1
Installationandserviceofthisreplaceshouldbe
performedbyqualiedpersonnel.Hearth&Home
TechnologiesrecommendsNFIcertiedprofes-
sionals,ortechnicianssupervisedbyan
NFIcertiedprofessional.
WOODBURNING FIREPLACE
Fire Risk.
WARNING
Forusewithsolidwoodfuelonly.
Otherfuelsmayoverreandgenerate
poisonousgases(i.e.carbonmonoxide).
Model(s):
Installation Manual
Installation and Fireplace Setup
WARNING
HOT SURFACES!
Glassandothersurfacesarehotduring
operationANDcooldown.
Hot glass will cause burns.
• DO NOTtouchglassuntilitiscooled
• NEVERallowchildrentotouchglass
• Keepchildrenaway
• CAREFULLY SUPERVISE children in same room as
replace.
• Alertchildrenandadultstohazardsofhightemperatures.
Hightemperaturesmayigniteclothingorotherammable
materials.
• Keep clothing, furniture, draperies and other ammable
materialsaway.
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
A36C, A36CH
A42C, A42CH
NOTICE: DO NOT discard this manual!
• DO NOTstoreorusegasolineorotheram-
mablevaporsandliquidsinthevicinityofthis
oranyotherappliance.
• DO NOToverre.Overringwillvoidyour
warranty.
• Complywithallminimumclearancestocom-
bustiblesasspecied.Failuretocomplymay
causehousere.
WARNING: If the information in these
instructionsisnotfollowedexactly,are
or explosion may result causing property
damage, personal injury, or death.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
2
Safety Alert Key:
• DANGER! Indicatesahazardoussituationwhich,ifnotavoidedwillresultindeathorseriousinjury.
• WARNING!Indicatesahazardoussituationwhich,ifnotavoidedcouldresultindeathorseriousinjury.
• CAUTION! Indicatesahazardoussituationwhich,ifnotavoided,couldresultinminorormoderateinjury.
• NOTICE:Indicatespracticeswhichmaycausedamagetothereplaceortoproperty.
Table of Contents
1 ProductSpecic&ImportantSafetyInformation
A.FireplaceCertication 4
B.Non-CombustibleMaterials 4
C.CombustibleMaterials 4
D.ElectricalCodes 4
2 Getting Started
A.TypicalFireplaceSystem 5
B.DesignandInstallationConsiderations 6
1.SelectingFireplaceLocations 6
2.LocatingFireplace&Chimney 7
C.ToolsandSuppliesNeeded 8
D.InspectFireplaceandComponents 8
E.FireplaceSystemRequirements 8
3 Framing and Clearances
A.FireplaceDimensions 9
B.Clearances 10
MinimumClearancestoCombustibles 10
C.ConstructtheChase 11
D.FrametheFireplace 12
E.SecureandLeveltheFireplace 12
F. ProtectiveMetalHearthStrips 13
G.FanKit(optional) 13
H.OutsideAirKit(optional) 14
4 Chimney and Termination Requirements
A.ChimneyRequirements 15
B.Offsets/Returns 16
C.TerminationRequirements 17
5 Chimney Installation
A.TypicalChimneySystem 18
B.AssembleChimneySections 19
C.SecureOffset/Return 20
D.InstallCeilingFirestops 20
E.InstallAtticInsulationShield 21
F. RoofPenetration 22
G.InstallChase/ChaseTop 22
H.TerminationCapRequirements 23
I. InstallTerminationCap 23
6 Shrouds
A.RadiationShield 25
B.FieldConstructedShrouds 25
1.OpenTopShroud 25
2.MailboxStyleShroud 26
3.RoofedStyleShroud 26
7 Finishing
A.FinishingMaterial 27
B.HearthExtension,BuildingandFinishing 28
1.FireplaceInstalledFlushontheFloor 29
2.RaisedHearthExtensionandRaisedFireplace 30
C.Non-CombustibleSealantMaterial 31
D.MantelandWallProjections 32
E.Sidewalls/Surrounds 33
8 Fireplace Setup
A.GasLog/LighterProvision 34
B.WoodBurningInserts 34
9 Reference Materials
A.ChimneyComponents 35
B.OptionalComponents 39
►

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 3
Customer:
Lot/Address
Model (circle one): A36C A36CH
A42C A42CH
YES IF NO, WHY?
Wiringhasbeeninstalledifnecessary.
Dealer/Distributor Phone #
Serial #:
Roofflashinginstalled.
Terminationinstalled.
Fireplace Install
ATTENTION INSTALLER:
Follow this Standard Work Checklist
Thisstandardworkchecklististobeusedbytheinstallerinconjuctionwith,notinsteadof,theinstructionscontainedinthisinstallation
manual.
Date Installed:
Location of Fireplace:
Installer:
WARNING! Risk of Fire or Explosion! Failure to install fireplace acording to these instructions can lead to a fire or
explosion.
Verifiedthatthechaseisinsulatedandsealed.(Pg.11)
Verifiedclearancestocombustibles.(Pg.10)
Fireplaceisleveledandsecured.(Pg.12)
Hearthextensionsize/heightdecided.(Pg.28)
Chimneyconfigurationcomplieswithdiagrams.
Chimneyinstalled,lockedandsecuredinplacewithproperclearance.
Chimneyairkitinstalled.
Firestopsinstalled.
Protectivehearthstripsinstalledpermanualrequirements.(Pg.13)
Outsideairkitinstalled.(Pg14)
ChimneySection4&5(Pg.15)
Atticinsulationshieldinstalled.
Shrouds Section 6 (Pg. 25)
Shroudisinstalledproperlyperinstructions.
Commentscommunicatedtopartyresponsible
4017-264•RevA•3-18-13
•Photographingtheinstallationandcopyingthischecklistforyourfile.
Combustiblematerialsnotinstalledinnon-combustibleareas.
Allpackagingandprotectivematerialsremoved.
Optionaldoorsproperlyinstalled.
Refractoryinstalledcorrectly.
Grateisproperlyinstalled.
Firescreeninstalledproperly.
(Builder/Gen.Contractor)(Installer)(Date)
Comments:Furtherdescriptionoftheissues,whoisresponsible(Installer/Builder/OtherTrades,etc.)andcorrectiveactionneeded:
Manualbagandallofitscontentsareremovedfromthefireplaceandgiventotheparty
responsibleforuseandoperation.
•Thatthischecklistremainvisibleatalltimesonthefireplaceuntiltheinstallationiscomplete.
__________________________by______________________on_________
Hearthextensioninstalledpermanualrequirements.
Verifiedallclearancesmeetinstallationmanualrequirements.
Mantelsandwallprojectionscomplywithinstallationmanualrequirements.
Fireplace Setup Section 8 (Pg. 34)
Hearth&HomeTechnologiesrecommendsthefollowing:
Finishing Section 7 (Pg. 27)

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
4
WARNING! Risk of Fire! Hearth & Home Technologies
disclaims any responsibility for, and the warranty and
agency listing will be voided by the following actions.
DO NOT:
• installoroperatedamagedreplace
• modifyreplace
• install other than as instructed by Hearth & Home
Technologies
• operate the fireplace without fully assembling all
components
• overre
• installunventedgaslogset
• installanycomponentnotapprovedbyHearth&Home
Technologies
• installpartsorcomponentsnotListedorapproved
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualied
installer, service agency or your dealer.
B. Non-Combustible Materials
• Materialswhich willnot igniteand burn,composed of
anycombinationofthefollowing:
- Steel - Iron
- Brick - Tile
- Concrete - Slate
- Glass - Plasters
• MaterialsreportedaspassingASTM E 136, Standard
Test Method for Behavior of Metals, in a Vertical Tube
Furnace at 750° C
C. Combustible Materials
• Materialsmadeoforsurfacedwithanyofthefollowing
materials:
- Wood - Compressedpaper
- Plantbers - Plastic
- Plywood/OSB - Sheetrock(drywall)
• Anymaterialthatcanigniteandburn;ameproofedor
not,plasteredorun-plastered
1 ProductSpecic&ImportantSafetyInformation
A.FireplaceCertication
D. Electrical Codes
NOTICE: This replace must be electrically wired and
grounded in accordance with local codes or, in the
absence of local codes, with National Electric Code ANSI/
NFPA 70-latest edition or the Canadian Electric Code
CSA C22.1.
• A110-120VACcircuitforthisproductmustbeprotected
with ground-fault circuit-interrupter protection, in
compliancewiththeapplicableelectricalcodes,when
itisinstalledindamplocations.
ThisreplacemaybeinstalledinsleepingroomsEX-
CEPTinmanufacturedhomes.Ifinstalledwithagaslog
set,provisionsfortheNationalFuelGasCodemustbe
met.
Thisreplacehasbeentestedandlistedforusewith
theoptionalcomponentsspeciedinthismanual.These
optionalcomponentsmaybepurchasedseparatelyand
installedatalaterdate.Anoutsideairkit,gasinsert,gas
logsetorgaslog-lightershouldbeinstalledatthetimeof
replaceinstallation.
HeatilatorisaregisteredtrademarkofHearth&Home
Technologies.
Thisreplacesystemhasbeentestedandlistedinaccor-
dancewithUL127andULC-S610standardsbyUnder-
writersLaboratoriesInc.forinstallationandoperationin
theUnitedStatesandCanada.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 5
2 Getting Started
A. Typical Fireplace System
Figure 2.1 Typical Fireplace System
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Non-combustible
roof flashing maintains
minimum clearance
around chimney
Additional lateral
support for chimney
above roof (or enclosed
in chase) if needed
Ceiling firestop
on floor of attic
Support straps
on rafter support
chimney (not shown)
Termination cap
Chimney penetrates roof
preferably without affecting
roof rafters
Offset & Return (with hanger straps)
Framing headed off
in ceiling joists
Enclosed space above
and around fireplace
Mantel and surround
Decorative facing
and trim
Hearth extension
Factory-built fireplace
Protective metal
hearth strip(s)
Outside
combustion air
Combustible framing/header
on top of V-shaped standoffs
Chimney system
Attic insulation shield (not shown)
must be used here to keep
insulation away from chimney
if attic is insulated
Storm Collar
Chimney Air Kit
(Section 8)
Required in
Canada. Outlet
must be no
less than 4 ft.
(1.22 m) off
ground level.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
6
F
E
D
BC
Across a
corner
G
As a
room
divider
A
48 in.
(1219 mm)
minimum
B
Along a wall
B
A1/2 in. (13 mm) all
configurations
G
3/4 in. (19 mm) min. air
space from fireplace to
combustible materials. 1/2
in. (13 mm) allowed at
nailing flanges.
Note:
G
A*
In an exterior chase
or projecting into a
garage
B
Note: Measurements are FRAMING dimensions only and do
not include drywall either in the cavity or on the interior walls.
H
H
H
*8 in. (203 mm) extra space
included for outside air
connection. If outside air duct
has no bend, this dimension
may be reduced as long as
minimum clearances are met.
Model # A B C D E F G H
in. 51 43 74 7/8 35 3/4 15 3/4 53 23
mm 1295 1092 1902 908 400 1346 584
in. 57 49 77 1/2 38 7/8 18 54 7/8 23
mm 1448 1245 1969 987 457 1394 584
A36
A42
12 in. (305 mm)
Minimum from FP
opening to any
perpendicular wall.
Figure 2.2 Fireplace Locations
NOTICE:
• Illustrationsandphotosreecttypicalinstallationsand
are FORDESIGNPURPOSESONLY.
• Illustrations/diagramsarenotdrawntoscale.
• Actualinstallation/appearancemayvaryduetoindividual
design preference.
• Hearth&HomeTechnologiesreservestherighttoalter
its products.
NOTICE: In addition to these framing dimensions, also
reference the following section: Clearances (Section 3).
NOTICE:
Aminimum3/4in.(19mm)airclearanceatthe
backandsidesofthereplaceassemblymustbe
maintained.
Chimney sections at any level require a 2 in. mini-
mum air space clearance between the framing
and chimney sections.
B. Design and Installation Considerations
NOTICE: Check building codes prior to installation.
• InstallationMUSTcomplywithlocal,regional,stateand
nationalcodesandregulations.
• Consultinsurancecarrier,localbuildinginspector,re
ofcialsorauthoritieshavingjurisdictionoverrestrictions,
installationinspectionandpermits.
• Before installing,determinethefollowing:
- Wherethereplaceistobeinstalled.
- Theventsystemcongurationtobeused.
- Gassupplypiping.
- Electricalwiring.
- Framingandnishingdetails.
- Whetheroptionalaccessories-devicessuchasa
fan,wallswitchorremotecontrol-aredesired.
1. Selecting Fireplace Locations
Thisreplacemaybeusedasaroomdivider,installed
alongawall,acrossacornerorusedinanexteriorchase.
SeeFigure2.2.
Locatingthereplaceinabasementshouldbeavoided.
Locatingnearfrequentlyopeneddoors,centralheat
outletsorreturns,orotherlocationsofconsiderableair
movementcanaffecttheperformance.
Considerationshouldbegiventothesefactorsbefore
decidingonalocation.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 7
2. LocatingFireplace&Chimney
Locationofthereplaceandchimneywillaffectperfor-
mance.
• Installwithinthewarmairspaceenclosedbythebuilding
envelope.Thishelpstoproducemoredraft,especially
duringlightinganddie-downofthere.
• Installingthereplaceinabasementisnotrecommended.
• Penetratethehighest partoftheroof.Thisminimizes
theeffectsofwindloading.
• Locate termination cap away from trees, adjacent
structures,unevenrooflinesandotherobstructions.
• Minimizetheuseofchimneyoffsets.
• Considerthereplacelocationrelativetooorandceiling
andatticjoists.
• Takeintoconsiderationtheterminationrequirementsin
Sections4and5.
Marginal Location:
• Below peak
Location NOT recommended:
• Not the highest point of the roof
• Wind loading possible
Multi-level Roofs
Windward
Leeward
Recommended Location:
• Above peak
Recommended:
• Insulated exterior chase
in cooler climates
Recommended Location:
• Above peak
• Inside heated space
Location NOT recommended:
• Too close to tree
• Below adjacent structure
• Lower roof line
• Avoid outside wall
Marginal Location:
• Wind loading possible
Figure 2.3 Recommended Chimney Locations
• Installtheoutsideairkitwiththeintakefacingprevailing
windsduringtheheatingseason.
• Ensure adequate outdoor air for all combustion
appliancesandexhaustequipment.
• Ensurefurnaceandairconditioningreturnventsarenot
locatedintheimmediatevicinityofthereplace.
• Avoidinstallingthereplaceneardoors,walkwaysor
smallisolatedspaces.
• Recessedlightingshouldbea“sealedcan”design.
• Attichatchesweatherstrippedorsealed.
• Atticmountedductworkandairhandlerjointsandseams
tapedorsealed.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
8
C. Tools and Supplies Needed
Beforebeginningtheinstallationbesurethefollowing
toolsandbuildingsuppliesareavailable:
Reciprocatingsaw Framingmaterial
Pliers Non-combustiblesealant
Hammer Gloves
Phillipsscrewdriver Framingsquare
Flatbladescrewdriver Electricdrillandbits
Plumbline Safetyglasses
Level Tapemeasure
1/2-3/4in.length,#6or#8self-drillingscrews
Misc.screwsandnails
D. Inspect Fireplace and Components
WARNING! Risk of Fire and/or Explosion! Damaged
parts could impair safe operation. DO NOT install dam-
aged,incompleteorsubstitutecomponents.Keepre-
place dry.
• Removereplaceandcomponentsfrompackagingand
inspectfordamage.
• Vent system components and doors are shipped in
separatepackages.
• Reporttoyourdealeranypartsdamagedinshipment.
• Read all the instructions before starting the
installation. Follow these instructions carefully
during the installation to ensure maximum safety
andbenet.
E. Fireplace System Requirements
TheHeatilatorreplacesystemrequirementsconsistof
thefollowing:
• Fireplace
- Refractory(includedwithreplace)
- Firescreen(includedwithreplace)
- Grate(includedwithreplace)
- HearthExtension(required,soldseparately)
• OutsideAirSystem(optional)
- AirInletHood
- Flex
• ChimneySystem
- AtticInsulationShield(includedwithreplace)
- Chimneyairkit(requiredinCanada,soldseparately)
- Chimneyterminationcap(required,soldseparately)
• Non-combustiblenishmaterial
• FK23FanKit(optional)
- JK9JunctionBox(includedwithreplace)
 BC10FanSpeedMotorControl(optional)

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 9
3 Framing and Clearances
A. Fireplace Dimensions
Figure 3.1 Fireplace Dimensions
Model # A B C D
in. 36 42 28 1/4 14 1/8
mm 914 1067 718 359
in. 42 48 30 7/8 15 1/2
mm 1067 1219 784 394
A36
A42

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
10
B. Clearances
WARNING! Risk of Fire!
You must comply with all minimum air space clearances
tocombustiblesasspeciedinFigure3.2.DO NOT pack
required air spaces with insulation or other materials.
Framing or nishing material used on the front of, or in
frontof,thereplacecloserthantheminimumslistedmust
be constructed entirely of non-combustible materials (i.e.,
steel studs, concrete board, etc.). Failure to comply may
causere.
Figure 3.2 Clearances to Combustible Materials
Minimum Clearances to Combustibles
WITHIN ENCLOSURE AREA
Fireplacetobackwall 3/4in.(19mm)
Fireplacetosidewall 3/4in.(19mm)
Topstandoffstoheader 0in.(0mm)
Dooropeningtosidewall 12in.(305mm)
MANTEL
Mantelminimumheight 43-1/2in.(1105mm)
Maximummanteldepth 12in.(305mm)
(insulation)
0 in. to level
of standoffs
Attic
Insulation
Shield
(ceiling)
(roof)
(attic)
(ceiling)
Ceiling Firestop
Offset/Return (secured
with hanger straps)
Storm Collar
Roof Flashing
3/4 in. (19 mm) to back &
sides of appliance
(except at nailing flanges
where it is 1/2 in. [13 mm])
Must have 2 in. (51 mm)
minimum clearance
to header
0 in.
to floor
2 in. (51 mm) min.
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Combustible Object
48 in.
1219 mm
Adapter attached here
(not shown)

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 11
C. Construct the Chase
Achaseisaverticalboxlikestructurebuilttoenclosethe
replaceand/oritsventsystem.Verticalchimneysthat
runontheoutsideofabuildingmustbeinstalledinsidea
chase.
Incoldclimates,Hearth&HomeTechnologiesrecom-
mendsthatthechasebewellinsulatedusingbatttype
insulationbetweenthejoists.
Constructionofthechasemayvarywiththetypeofbuild-
ing.Theseinstructionsarenotsubstitutesfortherequire-
mentsoflocalbuildingcodes.LocalbuildingcodesMUST
bechecked.
Chasesshouldbeconstructedinthemannerofalloutside
wallsofthehometopreventcoldairdraftingproblems.
Thechaseshouldnotbreaktheoutsidebuildingenvelope
inanymanner.Allouterwallsneedtobeinsulated.
Buildingcodesrequirefalseceilingandceilingrestops/
atticshieldsateachoorofthechaseorevery10ft(3048
mm)ofclearspacetocontrolspreadofre.
Walls,ceiling,baseplateandcantileveroorattherst
levelofthechaseshouldbeinsulated(seeFigure3.3.)
Vaporandairinltrationbarriersshouldbeinstalledinthe
chaseasperregionalcodesfortherestofthehome.Ad-
ditionally,Hearth&HomeTechnologiesrecommendsthat
theinsidesurfacesbedrywalledandtaped(ortheuseof
anequivalentmethod)formaximumairtightness.
Holesandotheropeningsshouldbecaulkedwithhigh
temperaturecaulkorstuffedwithunfacedberglass
insulation.
Ceiling
Firestop
Metal Chase To p
Round Termination Cap
False Ceiling
Insulation in the
outside walls
of the chase
Attic
Insulation
Shield
Chimney
Ceiling
Firestop
Tabs
False Ceiling
False Ceiling
Insulation
Insulation
Storm Collar
Figure 3.3 Chase Assembly
1 2 3
All outside walls should be insulated.
Figure 3.4 Chase Constructions
1. Fireplaceandchimneyenclosedinanexteriorchase.
 2. Chimneyoffsetthroughexteriorwallandenclosedinchase.
 3. Chaseconstructedonroof.
• Thechaseisconstructedusingframingmaterialsmuch
thesameasthewallsinyourhome.Avarietyofsiding
materials may be used including brick, stone, veneer
brick,orstandardsidingmaterials.
• In constructing the chase, several factors must be
considered:
- Maintain a 2 in. (51 mm) air space around the
chimney.
- The chase top must be constructed of non-
combustiblematerial.
- Incoldclimates,arestopspacerandatticinsulation
shieldshouldbeinstalledinaninsulatedfalseceiling
at the 8 ft. (2438 mm) level above the replace
assembly.Thisreducesheatlossthroughthechase.
- Incold climates, the walls of the chase should be
insulatedtothelevelofthefalseceilingasshownin
Figure3.3.Thiswillhelpreduceheatlossfromthe
homearoundthereplace.
ThreeexamplesofchaseapplicationsareshowninFig-
ure3.4.
WARNING! You must install false ceilings and ceil-
ing restops at each oor of the chase or every 10 ft
(3.05 m) to control spread of re.
WARNING! Risk of Fire! DO NOT sealareabetweenre
stop opening and chimney pipe except where they enter
the attic or leave the warm air envelope of the home (use
600° F sealant).
WARNING! Risk of Fire! Youmustmaintaina minimum
2in.(51mm)airspaceclearancetoinsulationandother
materials surrounding the chimney system.
• Insulationandothermaterialsmustbermlysecuredto
prevent accidental contact with chimney system.
• Thechasemustbeproperlyblockedtopreventblown
insulation or other combustibles from entering and
makingcontactwithreplaceorchimney.
• Failuretoprevent contactbetweeninsulationorother
materials and chimney system may cause overheating
andre.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
12
D. Frame the Fireplace
NOTICE: Hearth extension design must be determined
beforeinstallationofreplace.
Ifthereplaceisplacedontheoorthemaximumheight
ofanishedraisedhearthis2in.(51mm),ifyouwant
ahigherraisedhearththereplacemustbeplacedona
platform.
Thereplacewilltaframedopeningof:
A36: 41-1/2in.(1054mm)talland43in.(1092mm)wide,
A42:41-1/2in.(1054mm)talland49in.(1245mm)wide.
WARNING! Risk of Fire! Youmustcomplywithall
minimum air space clearances to combustibles. DO NOT
pack required air spaces with insulation or other materi-
als.
WARNING! Risk of Fire! Comply with all minimum clear-
ancesspecied.
• A minimum 3/4 in. (19 mm) air clearance must be
maintainedatthebackand3/4in.(19mm)tothesides
ofthereplaceassembly.
• Chimneysectionsatanylevelrequirea2in.(51mm)
minimum air space clearance between the framing and
chimney section.
Figure3.5showsatypicalframing(using2x4lumber)
ofthereplace,assumingcombustiblematerialsare
used.Allrequiredclearancestocombustiblesaroundthe
replacemustbeadheredto.SeeFigure3.2.Anyframing
acrossthetopofthereplacemustbeabovethelevelof
thetopstandoffs.(Norecessabovestandoffs.)
CAUTION! RiskofCuts/Abrasions.Wearprotectivegloves
and safety glasses during installation. Sheet metal edges
are sharp.
WARNING! Risk of Fire! Prevent contact with sagging,
loose insulation.
• DO NOT install against vapor barriers or exposed
insulation.
• Secureinsulationandvaporbarriers.
• Provideminimumairspaceclearancesatthesidesand
backofthereplaceassembly.
E. Secure and Level the Fireplace
Thisreplacemaybeplacedoneitheracombustibleor
noncombustiblecontinuousatsurface.Followthein-
structionsforframinginSection3.Slidethereplaceinto
position.Besuretoprovidetheminimum3/4in.airclear-
anceatthesidesand3/4in.atthebackofthereplace.
Thereplaceshouldbepositionedsothefaceofthenon-
combustiblematerialonthereplacewillbeushwiththe
faceofthedrywallonthewalls.
Levelthereplaceandshimasnecessary.
Figure 3.5 Framing the Fireplace
B
C
A
2 in. (51 mm)
min. air space
clearance
from chimney.
Header MUST NOT be notched!
D
D = extra space needed for outside air connection.
If outside air duct has no bend, this dimension may be
reduced as long as minimum clearances are met.
A B* C** D
in. 43 23 41 1/2 8
mm 1092 584 1054 203
in. 49 23 41 1/2 8
mm 1245 584 1054 203
** Adjust header height for a raised floor under fireplace.
Model #
A36
A42
* If interior of chase will be drywalled, add the thickness to
this measurement.
The nished cavity depth must be no less than 23 in.
(584mm)fromthenishedbackwalltotheoutsideoffront
wallframing.Framingmustextendstraightupalltheway
totheceiling.
1/2 in.
(13 mm)
Fireplace must be set out
1/2 in. (13 mm) in front of
the face of the framing
material.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 13
Protective metal strips are placed 2 in. (51 mm) under the
front of the fireplace and must extend beyond the front
and sides of fireplace opening by 2 in. (51 mm).
1 in. (25 mm)
overlap
Raised Platform
Floor
2 in.
(51 mm)
1 in. (25 mm) min.
overlap
2 in.
(51 mm)
T
op p
i
ece must over
l
ap
bottom piece
Nail or screw metal strips in place.
Figure 3.7 Protect the Front of an Elevated Platform
F. Protective Metal Hearth Strips
Figure 3.6 Position the Protective Metal Hearth Strips
• Locatethetwoprotectivemetalhearthstripsmeasuring
approximately26in.x4in.(660mmx102mm)included
withthisreplace.
• Slideeachmetalstrip2in.(51mm)underfrontedgeof
replace.
• Overlapstripsinthemiddleofreplaceopeningby1in.
(25mm)minimum.
• Metal strips must extend beyond the front and sides
of the replace opening by at least 2 in. (51 mm),
Figure3.6).
• Protectthefrontofaplatformelevatedabovethehearth
extensionwithmetalstrips(notincludedwithreplace)
per Figure 3.6. See Section 7 for hearth extension
instructions.
WARNING! Risk of Fire! Protective metal hearth
strips MUST be installed on combustible surfaces. DO
NOT cover metal strips with combustible materials.
Sparksorembersmayigniteooring.
WARNING! Risk of re! High temperatures, sparks,
embers or other burning material falling from the
replacemayigniteooringorconcealedcombustible
surfaces.
• ProtectivemetalhearthstripsMUSTbeinstalled.
• Hearth extensions MUST be installed exactly as
specied.
G. Fan Kit (optional)
Ifafanwillbeinstalled,thewiringmustbedonenow.
Use the instructions included with the accessories to
install:
• JK9JunctionBox(includedwithreplace)
• BC10MotorSpeedControlKit(soldseparately)
• FK23FanKit(soldseparately)

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
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H. Outside Air Kit (optional)
Ifyouinstallanoutsideairkit,Hearth&HomeTechnolo-
giesrecommendsyouutilizetheshortestductruntoop-
timizetheperformanceoftheoutsideairkit.Theoutside
airkitinlethoodshouldbepositionedinamannerthat
willnotallowsnow,leaves,etc.toblocktheinlet.Insome
installationstheairductmayneedtoberunvertically.
Insuchaninstallation,a3ft(914mm)heightdifference
mustbemaintainedfromthetopoftheuppermostchim-
neysectiontotheoutsideairinlethood.
RefertoFigures3.8and3.9whenplacingtheoutsideair
inlethood.
Theoutsideairkitisinstalledonthelefthandsideofthe
replace.
• Cuta4in.(102mm)holeinoutsidewalltoaccommodate
airpiping.
• Use4in.(102mm)ex(notsupplied)todirectlyconnect
outsideairtoreplaceintake.Insulatethepipetoprevent
frostcondensation.
• Usethesuppliedterminationcap.
• Seal between the wall and the pipe with silicone to
preventmoisturepenetrationandairleaks.
• Sealbetweentheterminationcapandthehousewith
siliconetopreventairinltration.
CAUTION! Risk of Cuts/Abrasions. Wearprotective
gloves and safety glasses during installation. Sheet metal
edges are sharp.
CAUTION! Risk of Fire or Asphyxiation! DO NOT draw
outsidecombustionairfromwall,oororceilingcavity,or
enclosed spaces such as an attic or garage.
• DO NOT place outside air hood close to exhaust vents or
chimneys. Fumes or odor could be drawn into the room
throughthereplace.
• Locateoutsideairinlettopreventblockagefromleaves,
snow/ice, or other debris. Blockages could cause
combustion air starvation. Figure 3.8 Outside Air Inlet Locations
Outlet placed
higher than 3 ft
below the
termination cap
Attic space
Garage or
combustible
liquids storage
Outlet blocked by
snow, leaves, etc.
Clear area
outside
house or in
ventilated
crawl space
YES
NO
NO
NO
NO
Factory-built
fireplace
• Use UL181 Class 0 or Class 1 rigid or flexible ducting.
• Install with short run or mainly straight duct, except small
dip for cold air trap which will help prevent flow of cold air.
• Secure flex duct with metal tape, screws or wire ties.
Figure 3.9 Outside Air Installation
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3 ft min. from
top of uppermost
chimney section
to air inlet.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 15
6 ft (1.83 m) max.
unsupported chimney
above roof
20 ft (6.10 m) max.
pipe between an
offset & return
35 ft (10.7 m)
max. straight
unsupported
chimney height
16.5 ft (5.03 m) min. height/single offset-return
20 ft. (6.10 m) min. height/double offset-return
90 ft (27.4 m) max. height
41-3/8 in.
(1051 mm)
Effective
Height
Ceiling firestop
Figure 4.1 Chimney Requirements
NOTICE: Amaximumoftwopairsofoffsetsandreturns
may be used.
Minimum overall straight height 16.5ft 5.03 m
Minimumheightwithsingleoffset/
return
16.5ft 45.03m
Doubleoffset/returnminimumheight 20 ft 6.1m
Maximum height 90ft 27.43m
Maximum chimney length between an
offset and return
20 ft 6.1m
Maximum distance between chimney
stabilizers
35 ft 10.67m
Maximum unsupported chimney
length between the offset and return
6 ft 1.83m
Maximum unsupported chimney
heightabovethereplace
35 ft 10.67m
Maximum unsupported chimney
above roof
6 ft 1.83m
WARNING! Risk of Fire! Youmustmaintain2in.(51mm)
air space clearance to insulation and other combustible
materials around the chimney system. Failure to do so
maycauseoverheatingandre.
NOTICE: You must provide support for the pipe during
construction and check to be sure inadvertent loading has
notdislodgedthechimneysectionfromthereplaceorat
any chimney joint.
A. Chimney Requirements
Verticaldistancesaremeasuredfromthebaseofthe
replaceasshowninFigure4.1.
4 Chimney and Termination Requirements
Table 4.2 Chimney Component Dimensions
Table 4.1 Chimney Requirements
HEIGHT OF CHIMNEY COMPONENTS in. mm
Chimney Stabilizer
SL3 4-3/4 121
Offsets/Returns
SL315 13-3/8 340
SL330 15-1/2 394
Chimney Sections*
SL306 4-3/4 121
SL312 10-3/4 273
SL318 16-3/4 425
SL324 22-3/4 578
SL336 34-3/4 883
SL348 46-3/4 1187
*Dimensionsreecteffectiveheight.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
16
B. Offsets/Returns
• Useanoffset/returntobypassoverheadobstructions.
• Anoffsetandreturncanbeusedasasingleentityorseparatedbychimneysection(s).
WARNING! Risk of Fire! DO NOT useoffset/returnsgreaterthan30°.Chimneydraftwillberestrictedandcouldcause
overheatingandre.Secureoffsetswithscrews(nottoexceed1/2”/13mminlength)Securereturnswithstrapping.
Straight chimney sections may be secured with screws. Keep chimney sections from separating or twisting.
• Measuretheshiftneededtoavoidtheoverheadobstruction.RefertodimensionAinFigure4.2.
• FindtheappropriateAdimensionlistedinTable4.3.TheBdimensioncoincidingwiththeAdimensionmeasurementin
Table4.3representstherequiredverticalclearanceneededtocompletetheoffset/return.
• Readacrossthecharttondthenumberofchimneysections/modelnumbersneededbetweentheoffsetandreturn.
A
B
1-1/4 in. (32 mm)
OVERLAP
Figure 4.2 Chimney Offset/Return
Table 4.3 Offset Dimensions
Example:
Your“A”dimensionfromFigure8.3is141/2in.(368
mm).UsingTable8.2thedimensionclosestto,butnot
lessthan141/2in.(368mm)is141/2in.(368mm)us-
inga30°offset/return.
Youdeterminefromthetablethatyouneed341/8in.
(867mm)(Dimension“B”)betweentheoffsetandre-
turn.
Thechimneycomponentthatbesttsyourapplicationis
oneSL324.
15-degree 30-degree
SL306 SL312 SL318 SL324 SL336 SL348
A B A B
in. mm in. mm in. mm in. mm
15/8 41 133/8 340 35/8 92 151/2 394 - - - - - -
27/8 73 173/4 451 51/2 140 185/8 473 1 - - - - -
41/8 102 223/8 568 71/4 184 213/4 552 2 - - - - -
41/2 114 235/8 600 81/2 216 233/4 603 - 1 - - - -
53/4 146 281/4 718 101/4 260 27 686 1 1 - - - -
6 152 293/8 746 111/2 292 29 737 - - 1 - - -
71/4 184 34 864 131/4 337 321/8 816 - 2 - - - -
73/4 197 361/8 918 141/2 368 341/8 867 - - - 1 - -
83/4 222 393/4 1010 161/4 413 373/8 949 1 - - 1 - -
103/8 264 455/8 1159 191/4 489 421/2 1080 - - 2 - - -
105/8 270 463/4 1187 201/2 521 445/8 1133 - - - - 1 -
117/8 302 513/8 1305 221/4 565 473/4 1213 1 - - - 1 -
131/2 243 571/4 1454 251/4 641 527/8 1343 - - - 2 - -
133/4 349 583/8 1483 261/2 673 55 1397 - - - - - 1
15 381 63 1600 281/4 718 581/8 1476 1 - - - - 1
161/2 419 683/4 1746 311/4 794 631/4 1607 - 1 - - - 1
18 457 745/8 1895 341/4 870 681/2 1740 - - 1 - - 1
195/8 498 803/8 2042 371/4 946 733/4 1873 - - - 1 - 1
205/8 524 841/8 2137 391/8 994 767/8 1953 1 - - 1 - 1
223/4 578 917/8 2334 431/4 1099 841/8 2137 - - - - 1 1
24 610 961/2 2451 451/8 1146 871/4 2216 1 - - - 1 1
257/8 657 1031/2 2629 491/4 1251 941/2 2400 - - - - - 2
Properassemblyofair-cooledchimneypartsresultinanoverlapatchimneyjointsof1-1/4in.(32mm).Effective
lengthisbuiltintothischart.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 17
Slanted Roofs
Flat Roofs
Chimney must
extend 3 ft (.9 m)
above the roof
Chimney must extend 2 ft (.6 m)
above any portion of the roof or
adjacent structures within
10 ft (3 m) of the chimney
Chimney must
extend 3 ft (.9 m)
above the roof
Chimney must extend 2 ft (.6 m)
above any portion of the roof or
adjacent structures within
10 ft (3 m) of the chimney
Multiple Chimney Locations
A B
6 in. (minimum) up to 20 in.
152 mm/508 mm
18 in. minimum
457 mm
20 in. and over 0 in. minimum
Gas, Wood or Fuel Oil
Termination Cap
Wood
Minimum
(See
illustration
above)
B
Gas
Termination
Cap **
A *
Perpendicular Wall
*
If using decorative cap cover(s), this distance may need to be
increased. Refer to the installation instructions supplied with the
decorative cap cover.
**
In a staggered installation with both gas and wood terminations, the
wood termination cap must be higher than the gas termination cap.
Figure 4.3 Multiple Chimney Locations
C. Termination Requirements
• Installacapapprovedandlistedforthisreplacesystem.
• Locatecapwhereitwillnotbecomepluggedbysnoworothermaterials.
• Locatecapawayfromtreesorotherstructures.
• Thebottomoftheterminationcapmustbeatleast3ft(.91m)abovetheroofANDatleast2ft(.61m)aboveanyportion
ofroofwithin10ft(3.05m).
• Thedistancerequiredbetweencapsisshownbelow.

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
18
5 Chimney Installation
Termination Cap
Additional
support for
tall chimneys
Storm Collar
Maintain minimum
clearances to
combustibles as
specified
Chimney must extend
beyond combustible
roof structure
Maintain minimum
height of chimney
above roof
Install roof flashing
according to minimum
requirements
Offsets/returns
may not exceed
30° from vertical Support straps for offsets/
returns must be secured
to adequate framing
Ceiling firestops
are required where
chimney passes
through ceiling or
floor
Attic Shield is
required where chimney
passes through attic
Figure 5.1 Typical Chimney System - Guidelines for Chimney System Installation
NOTICE: Chimney performance may vary.
• Trees,buildings,rooflinesandwindconditionsaffectperformance.
• Chimneyheightmayneedadjustmentifsmokingoroverdraftoccurs.
A. Typical Chimney System

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13 19
NOTICE: Chimney sections cannot be disassembled once
locked together. Plan ahead!
• Lockchimneysectionsand/oroffsets/returnstogetherby
pushingdownwarduntilthetopsectionmeetsthestop
beadonthelowersection.
• Pullonthetopsectiontomakesureitisfullyengaged
andwillnotseparate.
• Youmayuse#6or#8sheetmetalscrewsnolongerthan
1/2in.(13mm)tofastenchimneysectionstogether.Do
NOTpenetrateinnerue.
WARNING! Risk of Fire! YouMUSTusescrews(pro-
vided)tofastenoffset/returnstochimneysectionsto
keep the chimney parts from twisting. Failure to do so
couldcausere.
• Fasten offset/returns to chimney sections. Insert the
screws(provided)throughthepredrilledholes.DoNOT
penetrateinnerue.
• Secure chimney returns with hanger straps provided;
fastentostudsorjoists.
• Verticalstraightrunsofchimneymustbesupportedevery
35ft(10.7m).
B. Assemble Chimney Sections
Useonlythosecomponentsdescribedinthismanual.
Substituteordamagedchimneycomponentscouldimpair
safeoperationandcauseoverheatingandre.
Attacheitherastraightchimneysectionoranoffsetto
thetopofthereplace(dependingonyourinstallation
requirement).Chimneysectionsarelockedtogetherby
pushingdownwarduntilthetopsectionmeetsthestop
beadonthelowersection.
Theinnerueisplacedtotheinsideoftheuesection
belowit.Theoutercasingisplacedoutsidetheoutercas-
ingofthechimneysectionbelowit.SeeFigure5.2.
WARNING! Risk of Fire! DO NOT install substitute or
damaged chimney components.
Figure 5.2 Assembling Chimney Sections

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
20
C. Secure Offset/Return
D. Install Ceiling Firestops
CAUTION! Risk of Fire! Ceilingrestopsmustbeused
wheneverthechimneypenetratesaceiling/oor.
• Chaseconstructionrequiresceilingrestopsateach
oororevery10ft.(3.05m)ofclearspace.
• Theceilingrestopslowsspreadofreandreduces
coldairinltration.
• Installaceilingrestopwheneverchimneypenetrates
ceiling/oor.
• MarkandcutanopeninginceilingasshowninFigure5.4.
• Frametheopeningwiththesamesizelumberusedin
theceilingjoists.
• Nailtheceilingrestoptothebottomoftheceilingjoists
whenthereisaroomabove.
• Useanatticinsulationshieldiftheceilingisinsulated.
Theceilingrestopmaythenbeattachedaboveorbelow
thejoists.
ROOM ABOVE (non-insulated ceiling)
ATTIC ABOVE (insulated ceiling)
B
A
Ceilng firestop
attached to bottom
of framing
Ceiling firestop
attached to top of
framing
Note: Use same dimensional lumber for framing
ceiling firestop and joists.
2 in. (51mm)
clearance
2 in. (51mm)
clearance
WARNING! Risk of Fire! DO NOT seal area between
restopopeningandchimneypipeexceptwheretheyen-
ter the attic or leave the warm air envelope of the home
(use 600° F sealant).
Figure 5.4 Installing the Ceiling Firestop
Whenoffsetsandreturnsarejoinedtostraightpipesec-
tions,theymustbelockedintopositionwiththescrews
provided*(outeronly),usingthepredrilledholes.Topre-
ventgravityfrompullingthechimneysectionsapart,the
returnsandthechimneystabilizershavehangerstrapsfor
securingthesepartstojoistsorrafters.SeeFigure5.3.
* Use#6or#8sheetmetalscrew,orlarger,nolonger
than1/2in.(13mm).
WARNING! Risk of Fire!
• Secureoffsetswithscrews(nottoexceed1/2in./13mm
In length).
• Securereturnswithstrapping.
• Straightchimneysectionsmaybesecuredwithscrew
(nottoexceed1/2in./13mmInlength)atthejoints.
• Keepchimneysectionsfromseparatingortwisting.
Ceiling
Firestop
Straps
Optional
A
dditional
Support
Joint
Band
(Optional)
Figure 5.3 Secure the Chimney
Catalog #
A B
in. mm in. mm
FS338 14-1/2 368 14-1/2 368
FS339 14-1/2 368 18-3/8 467
FS340 14-1/2 368 23 584