DuraVent DuraTech Adjustable Length - Manual (Page 3)

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1. Determine the length of the Adjustable
Length needed for your installation. The
Adjustable Length can adjust from 14” to 22”.
There will be 1-1/4” lost to the joint between
the Adjustable Length 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 (Figure 2). Be very
careful on how much, if any, insulation is re-
moved from the male section. Refer to Table 1.
4. Twist lock the Adjustable Length into the
DuraTech chimney system. The Adjustable
Length is not intended to support chimney
either above or below. If the Adjustable Length
is installed in a system with more than 4-ft of
chimney above it, install either an Elbow Strap
or Tee Support immediately above the Adjust-
able Length to carry the additional weight of
the chimney above. Similarly, if the Adjustable
Length is supporting more than 4-ft of chimney
below it, install an Elbow Strap or Tee Support
immediately below the Adjustable Length to
carry the weight of the chimney below. See
Figure 3.
Table 1
Required
Total Length
Insulation
Removed
20” - 22”
0 strips
removed
18” - 20”
1 strip
removed
16” - 18”
2 strips
removed
14” - 16”
3 strips
removed
Figure 3
WARNING: The entire Adjustable Length
must be filled with insulation, without gaps.
The insulation of the female section must
be in contact with the insulation of the
male section. There must be a continuous
section of insulation within the Adjustable
Length. Failure to ensure the insulation is
continuous can result in a fire hazard.
3. Slide the two sections of the Adjustable
Length together, compressing the insulation as
needed to achieve the desired length. Impor-
tant: the outer walls of the two sections must
overlap a minimum of 2” to ensure a proper
connection. When the Adjustable Length is
at the correct length, secure the two sections
together with (4) sheet metal screws provided.
5. Complete the DuraTech chimney installa-
tion as directed in the full DuraTech Chimney
Installation Instructions (L150).
WALL STRAP OR
TEE SUPPORT
2” WIDE
INSULATION
STRIPS
TEE SUPPORT
OR WALL STRAP
WALL