Monessen Hearth 624DV(ST - Manual (Page 23)

42D0200
Designer Series Gas Fireplaces
23
9
1 /
2
"
9
1
/
2
"
FP1970
firestop no room
vENTING INSTaLLaTIoN
INSTaLLaTIoN FoR vERTICaL TERMINaTIoN
1. Determine the route your vertical venting will take. If ceiling joist,
roof rafters or other framing will obstruct the venting system, con-
sider an offset. Refer to Figure 32 to avoid cutting load bearing
members.
NoTE: Pay special attention to these installation instructions for
required clearances (air space) to combustibles when passing through
ceilings, walls, roofs, enclosures, attic rafters, etc. Do not pack air
spaces with insulation. Also note maximum vertical rise of the venting
system and any maximum horizontal offset limitations. Offsets must
fall within the parameters shown on Page 20, Figure 22.
2. Set fireplace in desired location. Drop a line plumb down from the
ceiling to the position of the flue exit. Mark the center point where
the vent will penetrate the ceiling. Drill a small locating hole a this
point.
Drop a plumb line from the inside of the roof to the ceiling locat-
ing hole in the ceiling. Mark the center point where the vent will
penetrate the roof. Drill a small locating hole at this point.
FLaT CEILING INSTaLLaTIoN
1. Cut a 9Z\x" (241 mm) square hole in the ceiling using the locating
hole as a center point The opening should be framed to 9Z\x" x 9Z\x"
(241 x 241 mm) inside dimensions as shown in Figure 33 using
framing lumber the same size as the ceiling joist. If the area above
the ceiling is an insulated ceiling or a room, nail firestop from the
top side. This prevents loose insulation from falling into the required
clearance space. Figure 33. Otherwise, install firestop below the
framed hole.
2. Assemble the desired lengths of pipe and elbows necessary to
reach from the burner system flue up through the firestop. Be
sure pipe and elbow connections are fully twist-locked. Page
18, Figure 18
3. Cut a hole in the roof using the locating hole as a center point.
(Cover any exposed open vent pipes before cutting hole in
roof). The 9Z\x" x 9Z\x" (241 x 241 mm) hole must be measured
on the horizontal. Actual length may be larger depending on
the pitch of the roof. There must be a 1" minimum clearance
from the vent pipe to combustible materials. (Insulation should
be considered a combustible material) Frame the opening as
shown on Page 18, Figure 17.
Figure 34 -
If area above is not a room, install firestop below
framed hole as shown
Nails
Firestop
FP1969
offset w/ wallstrap
Figure 32 -
Offset with Wall Strap and 45° Elbows
Roof
Flashing
Wall Strap
45° Elbows
Ceiling Firstop
FP1669
FP1969
firestop w room above
Figure 33 -
If area above is a room, install firestop above
framed hole as shown
Firestop
Nails
FP1969
FP1970