Monessen Hearth HDV500NV/PV - Manual (Page 23)

56D3048 3
HDV Series Direct Vent Gas Fireplace
VeNtING INStAllAtIoN
• The maximum angular variation allowed in the system
is 70°. Figure 31
• The minimum height of the vent above the highest point
of penetration through the roof is 1' (305 mm).
1
2
3
4
1
2
3
4
FP1179
max bends
Example: Elbow 1 = 90°
Elbow = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular = 70°
Variation
FP1179
Figure 31 -
Maximum Elbow Usage
INStAllAtIoN FoR VeRtICAl teRMINA-
tIoN
1. Determine the route your vertical venting will take. If
ceiling joist, roof rafters or other framing will obstruct
the venting system, consider 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 in Page 16, Figure 13.
. 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 ceil-
ing locating 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 10Z\x" (67mm) square hole in the ceiling using
the locating hole as a center point The opening should
be framed to 10Z\x" x 10Z\x" (67 x 67 mm) inside
dimensions as shown in Figure 34 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 insula-
tion from falling into the required clearance space.
Figure 33. Otherwise, install firestop below the framed
hole. The firestop should be installed with no less than
three nails per side. Figure 33
. Assemble the desired lengths of pipe and elbows nec-
essary to reach from the burner system flue up through
the firestop. Be sure pipe and elbow connections are
fully twist-locked. Page 17, Figure 15
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 10Z\x" x 10Z\x" (6 x
67 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 17, Figure 16
4. Connect a section of pipe and extend up through the
hole.
FP1969
offset w/ wallstrap
Figure 32 -
Offset with Wall Strap and 45° Elbows
Roof Flashing
Wall Strap
45° Elbows
Ceiling Firstop
FP1669