E. Use of Flex Vent
The flex 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 firestop loca- tion are considered to be supports.
3 in. CLEARANCE |
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FLEX VENT
1 in. CLEARANCE
Figure 7.3
Heat & Glo • | 25 |