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Figure 45
Converting a Masonry Chimney
Top Adapter
Flashing
4" Flex Liner
Retro Connector
Black Direct
Vent Pipe
ST961
ST961
masonry convert
20306761
7/07
Termination
Cap
Intrepid® Direct Vent - Rear Vent Gas Heater
Installation Instructions for Converting a Fac-
tory-Built Metal Chimney
1. Remove the existing chimney cap.
2. Measure the distance from the top end of the chimney
to the bottom of the ceiling support box, add 3" to this
measurement and cut a section of 4" flex pipe to that
length (the flex should already be extended to its nominal
length).
3. Connect the end of the flex pipe section to the underside
of the cap adapter you have selected using three (3)
sheet metal screws. (Fig. 46)
Figure 46
4. Pass the flex pipe down through the center of the chim-
ney system, and center the adapter on the top of the
chimney pipe. Drill four (4) 1/8" diameter holes through
the adapter and into the chimney top. Insure that you are
in fact, drilling into the metal on the chimney. Twist-lock
the termination cap (980, 991 or 930) onto the adapter.
(Figs. 47 and 48)
Figure 47
5. Pull the flex pipe down through the ceiling support box,
ST958
until it protrudes approximately 3" (76 mm). Connect
cap onto adapter
the flex pipe to the retro connector by slipping it into
7/07
the 4
⁄
"(121 mm) diameter sleeve on the top side of
3
4
the connector. Use three (3) sheet metal screws to
assemble these two parts.
Top
Adapter
Sheet
Metal
Screws
Flex
Pipe
ST957
ST957
flex pipe to cap
7/07
Termination
Cap
Sheet
Metal
Screws
1/8" Diameter
Figure 48
ST959
cap to adapter
7/07
Drill
Four (4)
Holes
25
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