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5. Tighten all the bolts of the containing ring. For each bolt, use the supplied
tool as a guide between the two containing rings. See Figure 18.
Wrench
(by others)
Figure 18 - Step 5 of the Adjustable Length
6. Install the outer pipe casing insulation (and insulation strip if Model DISPRO)
so the side with the bracket goes on the upstream section. See Figure 19.
NOTE: The outer wall must fit loosely and slide freely when the duct expands
or contracts.
NOTE: If the outer casing is too long, it may be cut to length by respecting the
minimum overlap of 1" with the outer wall of the inlet end section.
Figure 19 - Installation of Adjustable Length Step 6
13
VARIABLE LENGTH (LV): For Positive Pressure System and
Odd lengths
The Variable Length (LV) has one major function. It makes up odd lengths of
duct. It must not be used for expansion compensation.
NOTE: For high positive pressure application, such as on diesel generator exhaust, it is
allowed on the outside of the building only.
It is shipped with a flanged retaining band assembly on the inner sliding wall.
See Figure 20.
Tool Supplied
Half Outer
Retaining Band
Cuttable Half
Outer Casing
Adjustable Flanged
Retaining Band
Cuttable Sliding
Inner Wall
Figure 20 - Variable Length
The whole LV assembly includes:
See Figure 21 for details.
• A sliding inner wall that fit closely inside a standard pipe section and it is flanged on
one side.
• An adjustable flanged retaining band, composed of;
◦
Double flanged sleeve
◦
Retaining flanged collar
◦
An inner V-Band (BSI)
• Insulation band (DIS PRO)
• Split outer casing (DIS PRO/DAS PRO)
NOTE: Sealant must be ordered separately. See SEALANT USAGE in SECTION C.
Figure 21 - Detail of Variable Length
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Gas Flow
Retaining
Flanged Collar
Inner V-Band
(BSI)
Half Outer
Wall
Double Flanged
Sleeve
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