Heat & Glo Fireplace VRTIKL-AU - Manual (Page 19)

19 Heat & Glo • VRTIKL-AU • 2123-900 • 7/07
Step 4.
Assemble the desired lengths of pipe and elbows necessary
to reach from the gas stove up through the round support
box. Ensure that all pipe and elbow connections are in
their fully twist-locked position. Assemble as instructed.
Step 5.
Cut a hole in the roof centered on the small drill hole
placed in the roof in Step 2. The hole should be of sufficient
size to meet the minimum requirements for clearance
to combustibles, as specified. Continue to assemble
lengths of pipe and elbows necessary to reach from the
ceiling support box/wall thimble up through the roof line.
Galvanized pipe and elbows may be utilized in the attic,
as well as above the roofline. The galvanized finish is
desirable above the roofline, due to its higher corrosion
resistance (compared to black pipe).
NOTE:
(1 ) If an offset is necessary in the attic to avoid
obstructions, it is important to support the flue pipe
every 914 mm to avoid excessive stress on the
elbows, and possible separation. Wall straps are
available for this purpose, Figure 4.10, page 15.
(2) Whenever possible, use 45° elbows, instead of 90°
elbows. The 45° elbow offers less restriction to the
flow of flue gases and intake air.
Step 3.
To install the round support box/wall thimble cover in
a flat ceiling, cut a 254 mm square hole in the ceiling,
centered on the hole drilled in Step 2. Frame the hole as
shown in Figure 5.22.
ROUND CEILING
SUPPORT BOX/WALL
THIMBLE COVER
40 mm LONG
WOOD SCREWS
CEILING JOISTS
FRAMING
Figure 4.22
Step 6.
Slip the flashing over the pipe section(s) protruding through
the roof. Secure the base of the flashing to the roof with
roofing nails. Ensure the roofing material overlaps the top
edge of the flashing as shown in Figure 4.23. Verify that
the chimney is the required height above the roof. See
roof pitch table, Figure 3.3.
Step 7.
Continue to assemble pipe sections until the height of
the flue (before adding the termination cap) meets the
minimum local code requirements. Note that for steep
roof pitches, the flue height must be increased. See Roof
Pitch Table (Figure 3.3). In high wind conditions, nearby
trees adjoining rooflines, steep pitched roofs, and other
similar factors can result in poor draft, or down drafting. In
these cases increasing the flue height or switching to the
high wind termination cap may solve this problem.
CAP AND STORM COLLAR NOT SHOWN FOR CLARITY
SHINGLES OVERLAP ON
TOP EDGE OF FLASHING
Figure 4.23
Step 8.
Slip the storm collar over the pipe, and push it down to
the top of the flashing (Figure 4.24). Use non-hardening
sealant above and below the joint between the storm
collar and the pipe.
SECURE FLASHING WITH
NON-HARDENING SEALANT
AND ROOFING NAILS
Figure 4.24