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Page 27
VERTICAL TERMINATIONS (CONT.)
INSTALLATION INTO AN EXISTING MASONRY CHIMNEY
Step 1. Before cutting any holes, assemble the desired sections of direct vent pipe to determine the
center of the masonry penetration.
Step 3. Secure the flashing (SDV #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,
cut and fold flashing as needed to fit
chimney (Figure 23).
Step 4. To determine the length of flex needed,
measure from 3” (76mm) above the top of
the flashing down to the level of the opening.
Add the distance from the center of the
chimney out through the wall. Cut a piece
of 4” (102mm) flex to this length (extended
to its nominal length). Be sure to leave 2”-
3” (51mm-76mm) of flex above the existing
chimney to allow for connection to the
termination kit.
FIG. 22
Step 2. Once the center point of the penetration has
been determined, cut a 6” (152mm)
diameter hole in the masonry. If the hole is
too large, the retro connector might not
mount properly; if the hole is too small, the
appliance might starve for intake air. If there
is a frame wall in front of the masonry wall,
cut and frame a 10” (254mm) square
opening in the wall (centered around the 6”
[152mm] masonry opening). If there is sheet
rock only (no studs) in front of the masonry
the 10” (254mm) opening is still needed, but
does not need to be framed. This allows the
retro connector to mount directly on the
masonry and provide the correct clearances
to combustibles (see Figure 22).
FIG. 23