INSTALLATION (CONT.) PAGE 13
Vent Requirements
! Always maintain the required 1" clearance (air space) to combustible materials to prevent a fire
hazard. Do not fill air spaces with insulation.
! The gas appliance and vent system must be vented directly to the outside of the building, and never
be attached to a chimney serving a separate solid fuel or gas-burning appliance. Each direct vent gas
appliance must use it's own separate vent system.
! If the stove is installed at an
altitude over 3,000 feet the
flame quality will need to be
carefully evaluated. See
Addendum #1, "Altitude
Considerations", on page 38.
¥ When the vent passes through
a wall, a wall thimble is
required. When the vent
passes through a ceiling, a
support box or firestop is
required. When the vent
passes through the roof, a
roof flashing and storm collar
are required. Follow the
instructions provided with the
vent (from Duravent) for
installing these items.
Use a firestop spacer whenever
passing through a ceiling
(Duravent Part #963)
We recommend the use of
the high wind cap (# 991).
Use a roof flashing and storm collar
whenever passing through the roof
(Duravent Part #953 & #943 or #943S)
8-5/8"
Maintain a minimum 1"
clearance from vent to
any combustible (vent
is 6 5/8" diameter)
Use a support box
on exposed vent
Vertical Vent
Requirements
Use a wall thimble
whenever passing
through a wall
(Duravent Part #940)
Horizontal
Termination
Maintain a minimum 1" clearance from vent
to any combustible (vent is 6 5/8" diameter)
Minimum
Framing for
wall thimble
Horizontal Vent
Requirements
8-5/8"
Minimum framing
for fire stop
¥ Use Model GS Direct Vent manufactured by Simpson Dura-Vent only (or the Chimney Conversion
Kit - see Addendum #2). Follow the installation instructions included with the vent. For the nearest
Simpson Dura-Vent supplier, call (800) 835-4429. Part numbers and descriptions are listed below.
Straight Lengths
908B 6" Pipe Length, Black (interior)
907B 9" Pipe Length, Black (interior)
906 12" Pipe Length, Galvanized
906B 12" Pipe Length, Black (interior)
904 24" Pipe Length, Galvanized
904B 24" Pipe Length, Black (interior)
903 36" Pipe Length, Galvanized
903B 36" Pipe Length, Black (interior)
902 48" Pipe Length, Galvanized
902B 48" Pipe Length, Black (interior)
911B 11" to 14 5/8" Pipe, Adjustable, Black (interior)
Vent Terminations
981 Snorkel Termination (36" rise)
(for basement or raised
termination installations)
982 Snorkel Termination (14" rise)
(for basement or raised
termination installations)
984 Horizontal Square Termination
983 Vertical Termination
950 Vinyl Siding Standoff
991 High Wind Vertical
Termination
Elbows
990 90¥ Elbow
990B 90¥ Elbow, Black (interior)
945 45° Elbow
945B 45° Elbow, Black (interior)
Penetration, Support Parts
940 Round Support Box/Wall Thimble
941 Cathedral Ceiling Support Box
943 Flashing, 0/12 to 6/12 Roof Pitch
943S Flashing, 7/12 to 12/12 Roof Pitch
953 Storm Collar
963 Ceiling Firestop
988 Wall Strap
¥ Apply high-temperature silicone to the male section of inner
pipe (on the lower section of vent) so the silicone seals the
inner pipe from the outer pipe when the sections are
assembled. Slide the sections together and turn 1/4 turn until
the sections lock in place. Install three metal screws through
each joint to lock the outer section in place (see the
instructions included with the vent for further details).
¥ Horizontal sections require a 1/4" rise every 12" of travel
+ Exterior Vent Diameter = 6 5/8", Inner Vent Diameter = 4"
Apply a 1/8" bead of
high-temperature
silicone to the inner
pipe. The silicone
must seal the inner
pipe from the outer
pipe.
Silicone
¥ Horizontal sections require non-combustible support every three feet (e.g.: plumbing tape)
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