Monessen Hearth BLDV400 Installation And Operating Instructions Manual page 23

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, consider an offset. Refer to Figure 25 to avoid cut-
ting load bearing members.
For optimal flame appearance, a restrictor disk is necessary
on straight vertical runs of 20' of more.
• Runs may not incorporate elbows.
• The disk is part number 45D0551 and is included in
installation manual packet.
• Drop the disk into a 4" inner collar before installing
the first section of flue or install at the last section before
installing the termination.
• An additional disk may be installed on runs of 35' or
more. Rotate disks perpendicular to each other.
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 Figures
23 and 24, page 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
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 9 1 / " (241mm) square hole in the ceiling using the

locating hole as a center point The opening should be
1 1
framed to 9 / "x9 /

as shown in Figure 27 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. See Figure 26. Otherwise, install firestop
below the framed hole. Figure 27
2. Assemble the desired lengths of pipe and elbows neces-
sary to reach from the burner system flue up through the
firestop. Be sure pipe and elbow connections are fully
twist-locked.
74D0009
" (241mm x 241mm) inside dimensions

VENT INSTALLATION
Wall
Strap
Figure 25 - Offset with Wall Strap and 45°
Elbows
Firestop
Figure 26 - If Area Above is a Room, Install
Firestop above Framed Hole as Shown
"
/
1
2
9
Nails
Figure 27 - If Area Above is Not a Room, Install
Firestop above Framed Hole as Shown
Roof
Flashing
45° Elbows
Ceiling Firstop
Nails
9
1
/
"
2
Firestop
3