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STRAIGHT SECTIONS (DSLS-DSLD)
VERTICAL DRAIN LENGTH (DL)
A Drain Section is used to drain water on vertical installation. It is a special
variation of an 18" pipe length with provision to drain rain or condensate
from the chimney. The pipe flue is equipped with an annular catch gutter
wall and a 1" (25) NPT nipple extending through the casing for attachment
of drain piping. See Figure 29 for details. The drain piping should include
a water leg of a height at least equal to the maximum expected operat-
ing pressure at the appliance outlet to avoid allowing flue gases to vent
through the drain. Drain Length should be installed indoors to prevent
freezing.
Figure 29- Vertical Drain Length
HORIZONTAL DRAIN LENGTH (HDL)
1. Horizontal Drain length is equipped with a 1" (25) NPT nipple, which is
attached to the inner flue and extends through the outer casing to provide a
path to drain, condensate or water from the chimney. See Figure 30.
2. A dam is attached to the inside of the inner flue adjacent to the nipple to
channel the effluent to the drain.
3. The duct drain is intended for use at the end of a horizontal run where
access and drainage is needed (see Figure 30).
4. The drain coupling must be connected to a "P" trap or approved container
(supplied by others).
Figure 30- Horizontal Drain Length
22
VARIABLE LENGTH (LV)
The Variable Length (LV) has one major function. It makes up odd lengths
of duct. It must not be used for expansion compensation.
It is shipped with a flanged retaining band assembly on the innersliding
wall. See Figure 31.
Figure 31- Variable Length (LV)
The whole LV assembly includes:
• 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)
•
A different Inner Band (BS)
DSLD Only
• Split outer casing with flanged half band on the top side only.
NOTE: Viton® caulking must be applied on each Variable Length (LV) and
must be supplied by DuraVent. Sealant must be ordered
separately (Not included in the LV assembly).
Figure 32- Detail of Variable Length
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