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Existing Ceiling
Support Box
Figure 49
7. The connection between the appliance and the retro
ST960
connector may be completed with sections of black direct
support box
vent pipe, together with an adjustable length.
7/07
Installation Instructions for Converting a Masonry
Chimney
IMPORTANT: The existing masonry flue opening need to
have an area of at least 35 square inches (226 square mm)
to insure proper intake/exhaust flow.
1. Before cutting any holes, assemble the desired sections
of black direct vent pipe to determine the center of the
masonry penetration.
2. Once the center point of the penetration has been
determined, cut a 6" (152 mm) diameter hole in the
masonry. Be careful, if the hole is too large, the retro
connector might not mount properly. If the hole is too
small, then the appliance might starve for intake air. If
there is a frame wall in front of the masonry wall, cut and
frame a 10" (254 mm) clear square opening in the wall
(centered around the 6" (152 mm) masonry opening). If
there is sheet rock only (no studs) in front of the masonry,
the 10" (254 mm) clear opening is still needed, but does
not need to be framed. This allows the retro connector to
mount directly on the masonry and provide clearance to
the combustibles. (Figure 54)
3. Secure the flashing (705C) to the top of the masonry
chimney using a bead of non-hardening sealant-adhesive.
If the flashing is larger than the top of the chimney, then
cut and fold flashing as needed to fit chimney. (Figure 50)
4. To determine the length of flex required, measure from 3"
(76 mm) above the top of the flashing down to the level of
the opening. Add to this measurement the distance from
the center of the chimney to out through the wall. Cut a
piece of 4" (102 mm) flex to this length (the flex should
already be extended to its nominal length).
5. Connect the 4" flex liner to the cap adapter (985K) using
three sheet metal screws. (Figure 46)
6. Feed the 4" flex liner through the flashing into the chimney.
Continue to feed the liner out through the opening in the
masonry wall.
26
Sheet Metal
Screws (3)
Sheet Metal
Screws (3)
Cut & Bend
Flashing as
Needed to Fit
Chimney
Sealant -
Adhesive
Figure 50
centered in the opening
and the mounting holes
line up with the masonry
ST962
wall.
flashing
9. Slide the wall thimble
7/07
cover (940) over the retro
connector and secure
the with masonry bolts
as shown in Figure 53. If
you have a framed wall
in front of the masonry,
use wood screws to
mount the wall thimble
cover to the framed wall,
over the retro connector
and the 10" (254 mm)
square framed opening
as shown in Figure 54. If
needed, add a
section of direct
6" Diameter
vent pipe to the
Opening in
retro connector
Masonry Wall
i n
o r d e r
t o
extend through
Retro
Connector
the opening in
the wall thimble
cover.
10. The connection
b e t w e e n t h e
a p p l i a n c e
and the retro
connector may
be completed
with the section
of black direct vent pipe, together with an adjustable
length pipe section.
7. Secure the cap adapter
to the flashing. Use three (3)
sheet metal screws through
the side of the adapter into
the flange on the flashing as
shown in Figure 51. Twist-
lock the termination cap
(980,991, 930) on to the cap
adapter.
8. Attach the flex to the retro
connector. Use three sheet
metal screws to attach the
flex liner to the connector.
(Figure 52) Mount the retro
connector to the masonry
wall using masonry bolts. Re-
drill larger holes on connector
as needed. Be careful to
insure that the connector is
High Wind
Termination Cap
Standard
Termination
Cap
Top Adapter
Sheet
Metal
Screws (3)
Flashing
Figure 51
ST963
cap adapter
7/07
Masonry Bolts (3)
(Not included)
Figure 52
ST964
retro to masonry
7/07
20012761
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