Monessen Hearth Direct Vent Gas Fireplace BDV400 Installation And Operating Instructions Manual page 19

REAR WALL VENT INSTALLATION (continued)
4. Apply a bead of non-hardening mastic around the outside
edge of vent cap. Position the vent cap in the center of hole
on the exterior wall with the word "UP" on the vent cap
facing up. Insure proper clearance of 1" to combustibles is
maintained to the flue. Attach the vent cap with four wood
screws supplied. See Figure 17.
Do not recess vent termination
into any wall. This will cause a
fi re hazard.
NOTE: Replace the wood screws with appropriate
fasteners for stucco, brick, concrete, or other types
of siding.
A vinyl siding standoff (part #950) must be used with the Simpson/Selkirk Horizontal Termination (part #985) on vinyl,
stucco or wood-clad exterior walls. Apply non-hardening mastic around outside edge of the standoff instead of the vent cap
assembly. See Figure 18.
5. Slide the firestop over the vent pipe before connecting the horizontal run to the vent cap. See Figure 19.
6. The termination should overlap the flue a minimum of 1
Fasten termination with screws provided.
7. Slide the firestop against the interior wall surface and attach with screws. See Figure 19.
Apply
Mastic to
All Four
Nut
Sides
Figure 18 - Installing Simpson/Selkirk Vinyl
Siding Standoff and Termination
54D0700
Cut Vinyl Siding
Away to Fit Standoff
Standof #950
Simpson
Termination
#985
T
H O
Bolt
Wood Screw
Apply Mastic to
All Four Sides
Figure 17 - Installing Horizontal Termination
1
/ " Apply silicone to the outer pipe/termination connection.
4
Vent Cap
(Horizontal
Termination)
Figure 19 - Installing Firestop on
Horizontal Vent Pipe
VENT INSTALLATION
Vent Cap
T
H O
Wood
Screw
Interior Wall
Surface
Firestop
Horizontal
Screw
Vent Pipe
19