Monessen Hearth Direct Vent Gas Fireplace CDVR36 - Manual (Page 25)

69D0023 25
9
1 /
2
" 9
1
/
2
"
VENT 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,
consider an offset. See Figure 30 to avoid cutting 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 installa-
tion 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 shows in Figure 13, page 20.
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 9
1 /
2
" (241mm) square hole in the ceiling using the locating
hole as a center point The opening should be framed to 9 1 /
2
"x9 1 /
2
"
(241mm x 241mm) inside dimensions as shown in Figure 32using
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 31. Otherwise, install
firestop below the framed hole. See Figure 32.
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. See Figure
15, page 19.
Continued
Figure 30 - Offset with Wall Strap and 45°
Elbows
Roof
Flashing
Wall
Strap
45° Elbows
Ceiling Firstop
Figure 31 - If Area Above is a Room, Install
Firestop above Framed Hole as Shown
Figure 32 - If Area Above is Not a Room, Install
Firestop under Framed Hole as Shown
Firestop
Nails
Nails Firestop