Mastic Spark Modern Fires 91P - Manual (Page 23)

22 L100001 23
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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 27 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 shows in
Figure 10, page 16.
2. Set fireplace in desired location. Drop a plumb line 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 12, page
17 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 28. Otherwise, install firestop
below the framed hole. The firestop should be installed with no less
than three nails per side. See Figure 29.
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 13, page 17.
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 9
1 /
2
"x9 1/2 " (241mm x 241mm) 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 in Figure 12 on
page 17.
Figure 27 - Offset with Wall Strap and 45 Elbows
Roof
Flashing
Wall Strap
45° Elbows
Ceiling Firstop
Figure 28- If area above is a room, install firestop
above framed hole as shown
Figure 29 - If area above is not a room, install firestop
below framed hole as shown
Continued on next page
Firestop
Nails
Nails
Firestop