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5. Gas Vent Installation
CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD.
Failure to properly vent this furnace could result in
death, personal injury and/or property damage.
Read and follow all instructions in this section.
!
WARNING
Install the vent in compliance with codes of the country havingju-
risdiction, local codes or ordinances and these instructions.
This Category I furnace is fan--assisted. Afan assisted appliance
isanapplianceequippedwithanintegralmechanicalmeanstoei-
ther draw or force products of combustion through the heat ex -
changer.
Category I furnace definition: A central furnace which operates
with a non--positive vent static pressure and with a flue loss not
lessthan17percent. Thesefurnacesareapprovedforcommon--
venting and multi--story venting with other fan--assisted or draft
hood--equipped appliances in accordance with the NFGC or
NSCNGPIC
Category I Safe Venting Requirements
Category I furnace vent installations shall be in accordance with
Parts 10 and 13 of the National Fuel Gas Code (NFGC), ANSI
Z223.1--2002/NFPA54--2002;and/orSection7andAppendixCof
the CSA B149.1--00, National Standard of Canada, Natural Gas
and Propane Installation Code; the local building codes; furnace
and vent manufacturer’s instructions.
NOTE: The following instructions comply with the ANSI
Z223.1/NFPA54 National Fuel GasCode and CSA B149.1 Natu-
ral Gas and Propane Installationcode, based on theinput rate on
the furnace rating plate.
1. If a Category I vent passes through an attic, any concealed
space or floor, use ONLY Type B or Type L double wall vent
pipe.Ifventpipepasses throughinteriorwall,useTypeBvent
pipe with ventilated thimble ONLY.
2. Do NOT vent furnace into any chimney serving an open fire-
place or solid fuel burning appliance.
3. Use the same diameter Category I connector or pipe as per-
mitted by:
· the National Fuel Gas Code Code (NFGC) ANSI
Z223.1--2002 / NFPA 54--2002 sections 10and 13 vent-
ing requirements in the United States
or
· the National Standard of CanadaNatural Gas and Pro -
pane Installation Code (NSCNGPIC) CSA B149.1--00
section7 andappendixCventingrequirementsinCana-
da.
4. Push the vent connector onto the furnace flue collar of the
venterassemblyuntilittouchesthebead(atleast
5
/
8
² overlap)
and fasten with at least two field--s upplied, corrosion--resist-
ant, sheet metal screws located at least 140 ° apart.
5. Keep vertical Category I vent pipe or vent connector runs as
short and direct as possible.
6. Vertical outdoor runs of Type--B or ANY single wall vent pipe
below the roof line are NOT permitted.
7. Slopeallhorizontalrunsupfromfurnacetotheventterminal a
minimum of
1
/
4
² per foot (21 mm/m).
8. Rigidlysupportallhorizontalportionsoftheventingsystemev-
ery6¢ orlessusingproperclampsandmetalstrapsto prevent
sagging and ensure there is no movement after installation.
9. Checkexistinggasventorchimneytoensuretheymeetclear -
ances and local codes. See Figure 1
10. Thefurnace MUST be connected toa factory built chimneyor
vent complying with a recognized standard, or a masonry or
concretechimneylinedwithaliningmaterialacceptabletothe
authority having jurisdiction. Venting into an unlined ma-
sonrychimneyorconcretechimneyisprohibited.Seethe
6. Masonry Chimney Venting section in these instruc -
tions.
11. Fan--assisted combustion system Category I furnaces shall
not be vented into single--wall metal vents.
12. Category I furnaces must be vented vertically or nearly verti-
cally, unless equipped with a listed mechanical venter.
13. VentconnectorsservingCategoryIfurnaces shall not becon-
nectedinto anyportionofmechanicaldraftsystemsoperating
under positive pressure.
A4--to--3inchreducerispermittedatthefluecollarwheninstalling
a50,000Btuhgasinputfurnace,iftheinstallationmeetsallthefol-
lowing requirements for sizing the vent connectors and vents:
1. The National Fuel Gas Code, ANSI
Z223.1/NFPA--54--2002, sections 10.5.3.1(1),
10.6.3.1(2), 10.10.3.1, 13.1.2, 13.1.10, and 13.2.21(1)
through (3) in the U.S. or
2. The Natural Gas and Propane Installation Code CSA
B149.1--00, sections 7.13.1(b), 7.13.2(b), 7.18.5(b),
and Appendix C--GVR no. 2. in Canada.
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