DuraVent DuraTech 5-8 - Manual (Page 22)

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2” of clearance to combustibles, and enclose
the chimney where it passes through occupied
areas.
ADJUSTABLE CHIMNEY LENGTH
The DuraTech Adjustable Length is used when
an exact length of chimney is needed and
standard lengths of chimney are not sufficient.
The Adjustable Length spans from 15”-22”
(Fig.34) and can be used between any other
DuraTech chimney sections (straight pipe
lengths, elbows, tees, etc.).
1. Determine the length needed for your
installation. There will be 1-1/4” lost to the joint
between the Adjustable piece and the next
section of chimney.
2. Remove insulation strips from male end
of pipe, as needed, depending on the length
required for your installation (Fig.33). Be very
careful on how much, if any, insulation is re-
moved from the male section. Refer to Table 4.
WARNING: The entire Adjustable Length
must be filled with insulation, without gaps.
Failure to ensure the insulation is continu-
ous can result in a fire hazard.
3. Slide the two sections of the Adjustable
Figure 31
Figure 32
ANCHOR
PLATE
MASONRY
ANCHOR BOLTS
(4) REQUIRED
(NOT
FURNISHED)
EXISTING
MASONRY
CHIMNEY
WITH LEVELED
SURFACE
HIGH TEMP
SEALANT
MAINTAIN 1 INCH MIN
CLEARANCE FROM ANCHOR
PLATE TO COMBUSTIBLES
SHEET METAL
SCREWS
(4 REQUIRED)
CHIMNEY
SECTION
ANCHOR
PLATE
NOTE:
Follow local
building code
requirements
for connecting
factory-built
chimney to
masonry
fireplaces.
Figure 34
Figure 33
2” WIDE
INSULATION
STRIPS
15” - 22”
MALE END
SECTION
ADJUST LENGTH BY
REMOVING INSULATION
STRIPS (TABLE 1)
MIN 2”
OVERLAP
FEMALE END
SECTION