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VENTING INTO CLASS “A” CHIMNEYS
Simpson GS Dura
vent cap
Cap Adapter
Class “a Chimney
Roof Flashing
4” flex liner inside
Class “A” chimney
Ceiling rafters
Retro adapter
GS Simpson Dura
Vent pipe 4” x 6 5/8”
This model is also certified and tested to vent into
CLASS “A” wood.
stove chimneys
Place the freestanding direct vent appliance in the
desired location.
Using Simpson Dura Vent conversion kit #s 931-932-
933, depend on the ID diameter of the CLASS “A”
chimney that this appliance is to be vented into.
Place a bead of high temperature silicone or mil pac at
each connection to ensure a tight seal.
NOTE: A 4” flex liner must be used in the application.
NOTE: Use Simpson Dura Vent from the top of the
appliance until this vent reaches the CLASS “A”
chimney. Install the retro adapter to the top section of
GS direct vent pipe and install the flex liner to the retro
adapter.
Fully liner the CLASS “A” chimney with a minimum 4”
flex liner to the top of the CLASS “A” chimney.
Placing a bead of high temperature silicone to the
Simpson Cap adapter and securely attach the flex liner
to the adapter.
Secure the cap adapter to the CLASS “A” chimney
ensuring an air tight seal.
Install the vertical termination cap.
Light the unit and ensure proper operation.
THE USE OF ANY EXISTING CHIMNEY AS AN AIR
INTAKE IS NOT COVERED UNDER THE ANSI
Z21.88-1999 CSA 2.33-M99 TEST METHODS AND
THE RESULTING ITS/WHI PRODUCT
CERTIFICATION. THE CODE AUTHORITY HAVING
JURISDICTION MUST BE CONSULTED PRIOR TO
PROCEEDING WITH THIS INSTALLATION METHOD.
Mobile Home
• When the unit is installed in a Mobile Home it must be
grounded to the steel chassis or connected to a
grounding rod.
• In a Mobile Home installation the unit must be bolted
securely to the floor using the holes provided.
• Manufactured (mobile) home installation must be in accordance
with the Manufactured Home Construction and Safety Standard,
UL 307B, Title 24 CFR, Part 3280 and/or The Standard for
Manufactured Home Installations, ANSI A225.1/NFPA 501A
13
Holes for unit hold
down screws