Owner`s manual

13
139435_A GZ 455 DV 8/28/12
5.0 Venting Requirements
There are three types of venting configurations approved
for use with this fireplace.
•VerticalVenting/VerticalTermination
•VerticalVenting/HorizontalTermination
•HorizontalVenting/HorizontalTermination
OptimalVentConfigurations:
NaturalGas-5/8elbowdirectlytoreartermination.
Propane-4/6vent,4ft.verticalrisetoreartermination.
Thisapplianceisapprovedforusewiththe4/6and
5/8directventsystemsmanufacturedbythecompa-
nies listed in the Appendix on page 38.
A4/6VentAdaptorisincludedwiththeappliance.
 Use parts of one manufacturer only - DO NOT MIX
VENTCOMPONENTSFROMDIFFERENTMANUFACTUR-
ERSWITHINTHESAMESYSTEM.
 Installation of any components not manufactured
or approved by Atra or failure to meet all clearance
requirements will void all warranties and could result
inpropertydamageorbodilyinjury.
The approved vent configurations described in this
manual are derived from extensive testing under con-
trolled laboratory conditions. Gas appliance performance
can be negatively affected by variables present in the in-
stallation environment, i.e.; atmospheric pressure, strong
prevailingwinds,adjacentstructuresandtrees,snow
accumulation, etc. These conditions should be taken into
consideration by the installer and fireplace owner when
planning the vent system design.
IMPORTANT
Joint Sealing Requirement
Simpson Dura-Vent:
• Apply1/8”beadofhigh-
temperature, non-silicone
sealant or Mil-Pak® to the
male section of the inner
pipe. The cement should
form a seal between the
two inner pipe sections. See
fig. 5.1 and the vent manu-
facturer’s instructions.
• Nevermodifyanyventingcomponent,oruseany
damaged venting product.
• Thegasapplianceandventsystemmustbevented
directly to the outside of the building and never at-
tached to a chimney serving a solid fuel or gas burning
appliance. Each direct vent gas appliance must have
itsownseparateventsystem.Commonventsystems
are prohibited.
• Ifventingsystemisdisassembledforanyreason,rein-
stall per the manufacturer’s instructions provided for
the initial installation.

Fig. 5.1.
5.1HorizontalTermination
 Any horizontally terminated vent system that includes
a vertical run must terminate within one of the Zones
defined in the diagram in fig. 5.5. See page 15 for
important information regarding exhaust restriction
adjustments.
4/6ventrequiresa2footminimum vertical rise from
thetopventcollar.Seefig.4.11.
5/8ventmaybedirectedtoahorizontaltermination
with an 90° elbow straight off the top vent collar. See
fig.4.10.Themaximumhorizontalrun,withnovertical
rise,is4feet.
Amaximumofthree90°orsix45°elbowsmaybe
used in a horizontally terminated, top exit vent sys-
tem.Wheneverpossible,use45°elbowsinsteada90°
elbow as they offer less restriction to the flow of flue
gases and intake air.
Reducetheoverallhorizontalrunby4feetforeach
90°elbow,and2feetforeach45°elbow.
When two or more elbows are used in a horizontal run,
a less restricted setting may be more effective than that
indicated by the termination zone diagram.
The termination cap must not be recessed into the
wallorsiding. Do not fill air space in wall around termina-
tion cap with any type of insulation.
Wall Cut-out: 4/6ventrequiresa10”x10”minimum
square hole. 5/8ventrequiresaminimum11”X11”
square hole. These cut-outs are adequate for proper pipe
clearance through a wall provided the vent is positioned
tomaintain2”minimumclearanceatthetop.A1”-inch
minimum clearance must be maintained to combustible
material around the other sides. The wall cut-out must
be fully framed-in.
Anyhorizontalventrunmustbelevelorhavea1/4”
rise for every foot of run toward the termination cap.
Ventmaynotdirectdownwardatanypoint.
All horizontal terminations must comply with the clear-
ancespecificationstoadjacentstructuresasindicatedin
fig. 5.2.
Installation of a Vinyl Siding Standoff is required to
prevent damage to vinyl siding between the vent cap
and the exterior wall.
Ahorizontalterminationcapmustmaintaina3inchclear-
ancetoanyoverheadcombustiblematerialsthatproject2
1/2inchesorless.Projectionsexceeding21/2inchesrequire
a minimum 12 inch clearance to the edge of the vent termi-
nation. See fig. 5.3.
 Vinylsidingprojectionsrequireadefaultclearanceof18
inches to the top of the vent terminal.