74D0009
17
VENT INSTALLATION
REAR (THROUGH-THE-WALL) APPLICATIONS
Sealant is not required to assemble fireplace venting. Do
not use silicone sealant at the flue exhaust connections.
1. Find the pipe section's direction label. The label arrow
shall be pointed away from the firebox and toward the
termination. Firmly insert the initial rigid section/elbow
into the firebox outer collar. Simpson "GS" and Selkirk
"DT" outer walls are hemmed and will snap into the
collar's tabs. Attach Simpson's DirectVent Pro by fully
inserting into the collar and securing with self-tapping
screws. The screws shall only penetrate the flue outer
wall.
Refer to vent manufacturer's installation instructions
to properly assemble flue.
2. Locate and cut the vent opening in the wall. For com-
bustible walls first frame in opening.
Combustible Interior Walls:
Cut an 11
1
/
"H x
9
1
/
"W
hole through the interior wall.
Combustible Exterior Walls:
Cut a 9
1
/
"H x
9
1
/
"W
square hole through the exterior wall frame.
Figure 12
Noncombustible Walls:
Hole opening should be
7
1/
" (190 mm) in diameter.
3. The center of the hole should align with the center line
of the horizontal rigid vent pipe end. Pipe shall always
run level or uphill on horizontal runs. Never run pipe
down hill.
Figure 12
Female Locking Lugs
Male Slots
NOTE:
Horizontal runs
of vent must be sup-
ported every three feet
(914 mm). Use wall
straps for this purpose.
Figure 11 - Rigid Vent Pipe Connections
9
1
/
"
(241 mm
)
9
1
/
"
(241 mm
)
3
3
/
4
"
(92 mm
)
7
1
/
"
(190 mm
)
Figure 12 - Exterior Wall Framing Dimensions
Summary of Contents for Direct Vent BLDV400
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