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25Heatilator • GDST3831I • 2127-900 Rev. K • 7/12
E. Use of Flex Vent
The fl ex vent must be supported with the spacing between
support intervals not exceeding 4 feet, with no more than
1/2 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 7.3) requires only enough sup-
port to maintain the necessary clearance to combustibles.
However, the vent attachment point and the fi restop loca-
tion are considered to be supports.
1 in. CLEARANCE
FLEX VENT
3 in. CLEARANCE
TERMINATION CAP
Figure 7.3