Kenmore 229.960041 Owner's Manual page 5

Provision for combustion and ventilation air must be in accordance with Section 5.3, Air for Combustion and Ventilation, of
the National Fuel Gas Code, ANSI Z223.1-1atest revision, or applicable provisionsof the local building codes.
WARNING
Be sure to provide enough fresh air for combustion.
Enough air insures proper combustion and assures that
no hazard will develop due to the lack of oxygen.
NOTE
If you use a fireplace or a kitchen or bathroom exhaust
fan, you should install an outside air intake. These
devices will rob the boiler and water heater of combus-
tion air.
Youmustprovidefor enough freshair to assure propercombustion. Thefire
in the boiler usesoxygen,it musthavea continuoussupply.Theair in a
housecontainsonly enoughoxygento supplythe burnerfor a shorttime.
Outsideair mustenterthehouseto replace that usedby theburner.Study
followingexamples 1 and 2 to determine yourfreshair requirements.
EXAMPLE1: Boiler Locatedin UnconfinedSpace
An unconfined spaceis definedasa spacewhosevolumeis not lessthan
50 cubicfeetper!,000 Btuper hourofthetotalinputratingofall appliances
installedin that space.
If yourboiler is in an openarea(unpartitioned basement) i n a conventional
house, t heair that leaksthroughthecracks arounddoorsandwindows will
usuallybeadequate to provideair for combustion. T hedoorsshouldnotfit
tightly. Donotcaulkthecracksaroundthewindows.
Equipment locatedin buildingsof unusually tightconstruction shallbe pro-
videdwith air for combustion,ventilation, a nd diMion of flue gasesusing
the methods described in example 2B or shallbespeciallyengineered. The
authorityhavingjurisdiction mustapprovespeciallyengineered installa-
tions.
EXAMPLE2: Boiler Locatedin ConfinedSpace
A. All Air from Inside the Building: Theconfinedspace shall be pro-
videdwith twopermanent openingscommunicating d irectlywithanaddi-
tionalroom(s)of sufficientvolumeso that thecombinedvolumeof all
spacesmeetsthecriteriafor an unconfined space.Thetotal inputof all
gasutilizationequipment i nstalledin thecombinedspace shall be con-
sideredin makingthis determination. E achopeningshall havea mini-
mumfreeareaof onesquareinchper 1,000Btuperhourof thetotalinput
ratingol all gasutilizationequipment i n theconfinedspace, b ut notless
that100squareinches.Oneopeningshallbewithin 12 inchesof thetop
and one within 12 inchesof thebottomof theenclosure. T heminimum
dimension of air openingsshallnot be lessthan3 inches.
B,All Airfrom Outdoors: T heconfined space shallcommunicate w iththe
outdoors in accordance w ith methods1 or 2.Theminimumdimension of
air openings shall notbe lessthan3 in.Where ductsareused,theyshall
be of the samecross-sectional areaas the freeareaof theopeningsto
which theyconnect.
1. Twopermanent o penings,one commencing within 12 inchesof the
top,andonecommencing within 12inchesol thebottom,oftheenclo-
sureshallbeprovided. T heopenings shallcommunicate d irectly, o r by
theducts,with the outdoors or spaces (crawlor attic)thatfreelycom-
municate with theoutdoors,
a) Wheredirectlycommunicating w ith the outdoors or wherecommu-
nicatingto theoutdoorsthroughverticalducts,eachopening shall
havea minimumfreeareaof 1 sq. in. per4000 Btuperhourof total
inputratingof ag equipment i n theenclosure. ( SeeFigure3A.)
b)Wherecommunicating with the outdoors throughhorizontal d ucts,
eachopeningshall havea minimumfreeareaof 1 sq, in. per2000
Btuper hour of total inputratingol all equipment i n theenclosure.
(SeeFigure3B.)
2. Onepermanent o peningcommencing with 12 inchesofthe topof the
enclosure, s hall bepermitted wheretheequipment h asclearance of at
least1 inchfromthesidesandbackand6 inchesfrom thefrontof the
appliance, T heopening shaddirectlycommunicate w ith theoutdoors
or shallcommunicate t hrougha vertical o r horizontal d uct to theout-
doorsor spaces(crawlor attic)thatfreelycommunicate w ith theout-
doors,and shallhavea minimumfreearea of:
a) 1 sq, inch per3000Btuper hourof thetotal inpul ol all equipment
locatedin theenclosure (SeeFigure4),and
b) Not lessthanthesumof theareasof all venlconnectors in thecon-
finedspace.
I Figure 3A - FRESH AIR DUCT CAPACITIES (Btuh)
1 Square Inch per 4,000 Btuh
100% Free 75% Free 25% Free
Area Area Area
Fresh Air 1/4" Wire Metal Wood
Duct Size Mesh Louvers Louvers
3" x 12" 144,000 108,000 36,000
8" x 8" 256,000 192,000 64,000
8" x 12" 384,000 288,000 96,000
81/2" x 16" 512,000 384,000 128,000
I Figure 3B - FRESH AIR DUCT CAPACITIES (Btuh)
1 Square Inch per 2,000 Btuh
100% Free 75% Free 25% Free
Area Area Area
Fresh Air 1/4"Wire Metal Wood
Duct Size Mesh Louvers Louvers
3" x 12" 72,000 54,000 18,000
8" x 8" 128,000 96,000 32,000
8" x 12" 192,000 144,000 48,000
81/2"x 16" 256,000 192,000 64,000
I Figure 4 - FRESH AiR DUCT CAPACITIES (Btuh)
1 Square Inch per 3,000 6tuh
100% Free 75% Free 25% Free
Area Area Area
Fresh Air %" Wire Metal Wood
Duct Size Mesh Louvers Louvers
3" x !2" 108,000 81,000 27,000
8" x 8" 192,000 144,000 48,000
8" x 12" 288,000 216,000 72,000
81/2"x 16" 384,000 288,000 96,000
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