Masonry or Prefabricated Chimney
Conversion
The GF 300 DV is approved for use with Simpson Dura-
vent Chimney Kit #934 in a masonry chimney or a
prefabricated solid fuel listed chimney.
These installation requirements must be followed:
1. Use the guidelines for Coaxial Vent Termination
appropriate for your gas type on pages 11 - 12.
2. In masonry chimney, a fireclay liner or listed steel
liner, must be present the entire length of the chim-
ney.
3. Chimney height should not exceed 35 ft. (10.67 m).
4. The liner must have an inside dimension of 6" round
or greater. (USE KIT #934)
5. Prefabricated chimneys must be UL 103 or ULC S-629
listed and have a minimum INSIDE diameter of 6
inches, (150 mm). Prefabricated chimneys must be
listed for the specific Simpson Dura-Vent Chimney
Conversion Kit. (USE KIT #931, #932, or #933)
IMPORTANT NOTICE
THE USE OF AN EXISTING CHIMNEY
AS AN AIR INTAKE IS NOT COVERED
UNDER THE ANSI Z21.88-1999-CSA
2.33-M99 TEST METHODS AND RE-
SULTING ITS/WHI PRODUCT CERTIFI-
CATION. THE CODE AUTHORITY
HAVING JURISDICTION MUST BE
CONSULTED PRIOR TO PROCEEDING
WITH THIS INSTALLATION METHOD.
Exhaust
Gas
Cap Adaptor-
included in
#934 Kit
4" Flex Pipe
not included
in kit
Support/Wall
Thimble Cover -
included
in#934 Kit
Figure 16. Vent System through a masonry chimney
using the Simpson Dura-Vent Chimney Conversion Kit
#934. May also be used in listed prefabricated chimneys.
Drawing is for illustrative purposes only - DO NOT VENT
TWO APPLIANCES INTO A SINGLE CHIMNEY.
#991 Vertical
Termination Cap
Intake Air
Use Standard
Simpson
Dura-Vent GS
Pipe from
stove to
thimble
13