14
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Flange to flange length adjustment can range from
7”x 28 1/2”
NOTE
: If the flue is too long to fit into the adjacent section of duct without
interfering with the flow path, it should be trimmed to desired
flange to flange length plus an overlap of 4” with the inner wall
of the inlet end duct section. The minimum overlap for the outer
casing is
1”
with the inlet end section outer wall.
See
Figure 22
).
NOTE:
If an LV joint must be joined to one of these fittings, the unflanged end
of the tube should always point downward or towards downward slope.
Gas Flow
1” min
Sliding Inner
Wall
4” min
Figure 24 - Overlap Details for Variable Length
INSTALLATION STEPS FOR THE VARIABLE LENGTH (LV)
1. Measure the distance X required for the variable length. See
Figure 23
.
Distance ”X”
Figure 23 - Step 1 for Installation of Variable Length
2. Cut the inner wall at the dimension
X
found at the first Step plus 4”.
See
Figure 24a
.
3. Cut the split outer casing at dimension
X
plus 1”.
See
Figure 24b
.
4. Then cut the insulation band at dimension
X
+ 6” (DIS PRO only).
See
Figure 24c
.
Cut Sliding Inner
Wall to X + 4”
Figure 24a - Step 2 - Cut of the Sliding
Inner Wall
Cut Split
Outer
casing to
X + 1”
Figure 24b - Step 3 - Cut of the Outer Casing
Cut Insulation
(DIS PRO Only)
to X + 6”
Figure 24c - Step 4 - Cut of the Insulation
Desired
Length ”X”
