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

 

TERMINATION CAP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FLEX VENT

1 in. CLEARANCE

Figure 7.3

Heatilator • GDST3831I • 2127-900 Rev. F • 10/08

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Hearth and Home Technologies GDST3831I owner manual Use of Flex Vent