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E. Measuring Standards
Vertical and horizontal measurements listed in the vent
diagrams were made using the following standards:
• Pipe measurements are shown using the effective length
of pipe. See Section 12.A (Figure 12.1 for DVP, Figure
12.7 for SLP) for information on effective length of pipe
components.
• Horizontal terminations are measured to the outside
mounting surface (fl ange of termination cap) (see Figure
4.3).
• Vertical terminations are measured to bottom of
termination cap.
• Horizontal pipe installed level with no rise.
• Horizontal termination cap should have a 1/4 inch
downward slant to allow any moisture in cap to be
released.
F. Use of Flex Vent
The fl ex vent must be supported with the
spacing between support intervals not ex-
ceeding 4 feet, with no more than ½ inch
sag between supports.
A support is required at each change in
venting direction, and in any location where
it is necessary to maintain the necessary
clearance to combustibles. A simple "up
and out" installation (Figure 4.6) requires
only enough support to maintain the neces-
sary clearance to combustibles. However,
the vent attachment point and the fi restop
location are considered to be supports.
FLEX-VENT
Figure 4.6
Heatilator • MDV3732 Installation Manual • 2386-980 Rev. D • 11/16
3 in. CLEARANCE
TERMINATION
CAP
1 in.
CLEARANCE
15
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