FMI MM39/44/49VF Outdoor Fireplace User Manual


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10
Interior Wall Materials:
Wall materials,suchasdrywall, shouldbeset ushwith
theroughfrontfaceoftheVent-Freereplace.Thiswillallow
forplacementofrequirednon-combustiblesurroundmaterialin
suchawaythatthesurroundmaterialcanlayatagainstthe
nishedwallsurfaceandalsoalignwiththeleadingedgeofthe
rebrickinterioroftheVent-Freereplace(seeFigure 15).
Trim Facings:
Parts ofthe combustible mantle assemblylocated along
thesidesofthereboxopening,whichprojectmorethanone
andone-halfinches(1-1/2”)fromthefaceofthereplace,shall
bekeptatleasteightinches(8”)fromthereboxopening.
Adjoining Room Walls:
Interior wall surfaces of adjoining room walls must be at a
minimumhorizontalmeasureoftwentyfourinches(24”)away
fromthenishedopeningoftheVent-Freereplace.
D1
W
1-1/2”
8”MIN.NON-COMBUSTIBLEMATERIAL
FRAMING
Figure 14
Model W D1
MM39VF 43” 73-1/2”
MM44VF 48” 77”
MM49VF 53” 80-1/2”
1-1/2”
8”MIN
20”
MIN
8”MIN.NON-COMBUSTIBLEMATERIAL
FRAMING
Figure 15
Air for Combustion and Ventilation
Energyefcienthomesrequirehomestobeairtightbutatthe
same time provide sufcient fresh air to breathe. Fresh air
enters thehome throughair conditioning ductvents, around
doorsandwindowsbutalsomustprovideenoughfreshairfor
propercombustiononallfuel-burningappliancesinthehome.
Exhaust fans, replaces, clothes dryers, and fuel-burning
appliancesdrawairfromthehousetooperate.Youmustprovide
adequatefreshairfortheseappliances.Thiswillinsureproper
ventingofventedfuel-burningappliances.
Non-combustible
FlexHose
Figure 16
Exterior
Providing Adequate Ventilation
InaccordancewiththeNationalFuelGasCodeNFPA54/ANSI
Z223.1, Section 5.3, Air for Combustion and Ventilation, all
spacesinhomesfallintooneofthethreefollowingventilation
classications:
1.UnusuallyTightConstruction
2.UnconnedSpace
3.ConnedSpace
Thefollowinginformationwillhelpyouclassifyyourspaceand
provideadequateventilation.
Unusually Tight Construction
Theairthatleaksarounddoorsandwindowsmayprovide
enough fresh air for combustion and ventilation. However,
in homes of unusually tight construction, you must provide
additionalfreshair.Unusuallytightconstructionisdenedas
constructionwhere:
a.Wallsandceilingsexposedtotheoutsideatmospherehave
acontinuouswatervaporretarderwitharatingofoneperm*
orlesswithopeningsgasketedorsealedand...
b.Weatherstrippinghasbeenaddedonopenablewindowsand
doorsand...
c. Caulking or sealants are applied to areas such as joints
aroundwindowanddoorframes,betweensoleplatesand
oors,betweenwall-ceilingjoints,betweenwallpanels,at
penetrations for plumbing, electrical, and gas lines, and
otheropenings.
*Apermisaunitofpermeanceorwatervaportransmission,
theUSperm-inchisdenedasthepassageof1grainofvapor
through1squarefootof1inchthickmaterialin1hourundera
pressuredifferenceof1inchofmercury.
Ifyourhomemeetsallthethreecriteriaabove,youmustprovide
additionalfreshair.
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