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Example:
A 10' section and an elbow used in conjunction with 3 ft. flex section
(PFL-3) will, when extended in a five foot chase, allow for a maximum
horizontal run of twelve and one-half feet from the centre of the
fireplace to outside wall and a minimum of 7'6" when retracted in
opposite direction. (See Figure 6 and 7.)
"D" flex sections and "E" solid sections may be used in conjunction with
one another to obtain different possible horizontal length installations.
NOTE: Flex section must not exceed maximum horizontal length of 3
feet. (See Figure 8.)
Heat Shields
Due to high flue temperatures, heat shields are
required on all M38ODV-ST installations at the
point where the venting passes through the
wall to connect to the termination.
Using the heat shield, vent clearances at this
point are 1" to combustible construction.
Figure 5.
Heat Shield. Install by sliding over the vent pipe where it
passes through combustible construction.
150" max.
Flex Section
Hearth
Figure 6. Extended installation.
Figure 7. Retracted installation.
XG0128
Installation
126"
Heat
Shield
Termination
Solid Section w/
90° Elbow
Exterior
Wall
30" Max.
Heat
126"
Shield
Solid Section w/
90° Elbow
Termination
Flex Section
Exterior
Wall
Hearth
M38ODV-ST Direct Vented Fireplace
Flex Section
Hearth
Figure 8. Horizontal flex installation.
Reduced Clearance Installation
If your installation requires construction above the fireplace (TV
stand, bookshelf, window between rooms, etc.) you must use the
DVST-CNT Offset Box.
Min. framing height is 48" to the underside of
combustible materials.
Max. total horizontal vent length is 55" from the
center of the fireplace.
Use PEXT horizontal vent pipe to obtain desired
horizontal vent lengths.
Shelf
DVST-CNT
Header
49" Min.
48"
Figure 9.
Installation with the DVST-CNT Offset box.
C
16" Min.
C
39 3/4
End View of a DVST-CNT Installation.
Figure 10.
3' max.
Heat
Shield
Termination
Exterior
Wall
55" Max.
Heat
Shield
39 3/4
To maintain clearances
to combustibles, notch
studs at same height as
vent pipe when
Hearth
horizontal vent run is
used. (see Figure 2a.)
Page 7
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