Flueing - Vertical Termination - Masport P121-NG Owners & Installation Manual

VERTICAL
TERMINATION
1) Maintain the 40mm clearances (air spaces)
to combustibles when passing through ceil-
ings, walls, roofs, enclosures, attic rafter,
or other nearby combustible surfaces. Do
not pack air spaces with insulation. Check
pages 16-18 for the maximum vertical rise
of the flueing system and the maximum
horizontal offset limitations.
2) Set the gas appliance in its desired location.
Drop a plumb bob down from the ceiling to
the position of the appliance flue exit, and
mark the location where the flue will pene-
trate the ceiling. Drill a small hole at his point.
Next, drop a plumb bob from the roof to the
hole previously drilled in the ceiling, and
mark the spot where the flue will penetrate
the roof. Determine if ceiling joists, roof
rafters or other framing will obstruct the
flueing system. You may wish to relocate
the appliance or to offset, as shown in
Diagram 2 to avoid cutting load bearing
members.
Diagram 1
Diagram 2
Masport P121/P121LC/P121RC/P131 Zero Clearance Room Sealed Gas Fireplace
Note: Apply sealant "Mill-Pac" to inner
pipe and high temperature silicone
sealant to outer pipe on every twist-
lock joint.
3) A Firestop spacer must be installed in the
floor or ceiling of every level. To install the
Firestop spacer in a flat ceiling or wall, cut
a 10 inch square hole. Frame the hole as
shown in Diagram 3 and install the firestop.
Diagram 3
4) Assemble the desired lengths of pipe and
elbows.
5) Cut a hole in the roof centered on the small
drilled hole placed in the roof in Step 2. The
hole should be of sufficient size to meet the
minimum requirements for clearance to com-
bustibles of 40mm. Slip the flashing under
the shingles (shingles should overlap half
the flashing) as per Diagram 4. (Flashing not
supplied).
Diagram 4: The upper half of the flashing is
installed under the roofing material and not
nailed down until the chimney is installed.
This allows for small adjustments.
6) Continue to assemble pipe lengths.
Note: If an offset is necessary in the attic
to avoid obstructions, it is impor-
tant to support the flue pipe every
3 feet, to avoid excessive stress
on the elbows, and possible sep-
aration. Wall straps are available
for this purpose (Diagram 2).
Galvanized pipe is desirable above the roof-
line due to its higher corrosion resistance.
Continue to add pipe sections through the
flashing until the height of the flue cap meets
the minimum height requirements specified in
Diagram 5 or local codes. Note that for steep
INSTALLATION
roof pitches, the vertical height must be in-
creased. A poor draft, or down drafting can
result from high wind conditions near big trees
or adjoining roof lines, in these cases, increas-
ing the flue height may solve the problem.
Diagram 5
7) Ensure flue is vertical and secure the base
of the flashing to the roof with roofing rails,
slide storm collar over the pipe section and
seal with a mastic.
8) Install the vertical termination cap.
Note: Any closets or storage spaces,
which the flue passes through
must be enclosed.
Offset Chart
19