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117437-01D 9
INSTALLATION PRECAUTIONS
NOTICE: Failure to follow these in-
structions will void the warranty.
• Wear gloves and safety glasses for
protection
or when on roof tops
• Be aware of electrical wiring locations in
walls and ceilings
The following actions will void the warranty
on this product:
• Installation of any damaged venting
component
system (Do not cut or alter vent compo-
nents)
• Installation of any component part not
manufactured or approved by DESA Heat-
• Installation other than as instructed by
these instructions
WARNING: Read all instruc-
tions completely and thoroughly
before attempting installation.
Failure to do so could result in
serious injury, property damage
or loss of life.
WARNING: B-type vent pipe
airspace clearance to combus-
tibles is 1" on all sides. Where
the vent pipe passes through a
vertical wall a listed thimble ap-
proved for use with B-type vent
must be used.
VENTING INSTALLATION
A 4" B-type venting system must be connected
to the appliance for venting to the outside of
the building.
The following section is provided as a guide to
install a standard B-type vent installation.
Standing code requirements concerning
B-type vent installations may vary within
-
check with your local building code authority
-
rent National Fuel Gas Code NFPA 54/ANSI
Z223.1 or in Canada with CAN/CSA B149
for Category I systems using double wall
B-1 vent pipe.
This gas appliance must be vented to the
outdoors only and may not be terminated into
a solid fuel burning appliance.
This appliance may be vented through a
manufactured chimney liner system if all are
and/or building authorities.
are typical of most B-vent installations and
code practices.
WARNING: This gas replace
and vent assembly must be vented
directly to the outside. The venting
system must NEVER be attached
to a chimney serving a separate
solid fuel burning appliance.
Example 1: Shows the minimum allowable sys-
tem height and lateral offset for a 60° or greater
-
low the 75% rule for lateral to total vertical sys-
tem height. Codes also allows only one offset
in the total system when at 60° or greater. The
total vertical height in this example represents
the minimum height of 8 feet and therefore the
allowable lateral is 6 feet when the 75% rule
applies. If the lateral length must exceed 75%
with the Category I venting tables.
Example 2: Shows multiple offsets each at
45° of inclination. Multiple offsets are permit-
ted if they do not exceed 45° of inclination.
The total lengths of the two offsets are not
required to meet the 75% rule.
Example 3: Shows a single offset at 45° of
inclination and therefore the lateral length at 10
feet of offset does not have to meet the 75%
allowable rule.