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INSTALLATION
Diagram 3
to ensure that the termination is
not recessed into the siding.
7) Before connecting the horizontal run of flue
pipe to the flue termination, slide the Wall
Thimble (Part # 942) over the flue pipe.
8) Slide the appliance and flue assembly to-
wards the wall carefully inserting the flue
pipe into the flue cap assembly. It is impor-
tant that the flue pipe extends into the flue
cap sufficient distance so as to result in a
minimum pipe overlap of 1-1/4 inches. Se-
cure the connection between the flue pipe
and the flue cap by attaching the two sheet
metal strips extending from the flue cap
assembly into the outer wall of the flue pipe.
Use the two sheet metal screws provided
to connect the strips to the pipe section. See
Diagram 4.
9) Install wall thimble in the center of the 10"
square and attach with wood screws (Di-
agram 5).
Diagram 4
Diagram 5
20
VERTICAL
TERMINATION
1) Maintain the 1-1/4" clearances (air
spaces) to combustibles when
passing through ceilings, walls,
roofs, enclosures, attic rafter, or
other nearby combustible surfac-
es. Do not pack air spaces with
insulation. Check pages 17-19 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 penetrate 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 Dia-
gram 2 to avoid
cutting
load
bearing mem-
bers.
Diagram 2
Note: Apply sealant "Mill-Pac" to inner
pipe and high temperature sili-
cone sealant to outer pipe on eve-
ry 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.
Masport PG121/PG131 Zero Clearance Room Sealed Gas Fireplace
4) Assemble the desired lengths of pipe and
elbows. Ensure that all pipes and elbow
connections are in the fully twist-locked
position and sealed.
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 1-1/4". Slip the flashing under
the shingles (shingles should overlap half
the flashing) as per Diagram 4.
Diagram 1
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
Roof Pitch
flat to 7/12
over 7/12 to 8/12
over 8/12 to 9/12
over 9/12 to 10/12
over 10/12 to 11/12
over 11/12 to 12/12
over 12/12 to 14/12
over 14/12 to 16/12
over 16/12 to 18/12
over 18/12 to 20/12
over 20/12 to 21/12
Diagram 3
Diagram 5
Minimum Vent Height
Feet
Meters
2
0.61
2
0.61
2
0.61
2.5
0.76
3.25
0.99
4
1.22
5
1.52
6
1.83
7
2.13
7.5
2.29
8
2.44
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