14
Figure 11: Vertical Vent Installation
Figure 10: Horizontal Vent Terminal
V. Venting (continued)
H.
Vertical (Through Roof) Vent Installation
1. Install vertical vent drain tee. See Figures 11 and 12.
Attach tee directly to elbow or horizontal pipe from
elbow.
2. Slope horizontal runs minimum ¼ inch per foot.
Slope toward vertical vent drain tee. Position weld
seams in vent pipes in all horizontal runs at the top
to avoid condensate from lying on the seams.
3. Install firestops at floor and ceiling where vent
passes through floor, ceiling, or framed wall. The
firestop must close the floor or ceiling opening
between vent pipe and structure.
4. Enclose vent passing through unoccupied or
occupied spaces above the boiler with materials
having a fire resistance rating at least equal to the
rating of adjoining floor or ceiling. Maintain
minimum clearance to combustible materials.
Note: For one- or two-family dwellings fire
resistance rating requirement may not need to be
met, but is recommended.
5. Whenever possible install vent straight through roof.
Refer to Figure 13 if offset is necessary. Maintain
minimum clearance to combustible materials.
6. Install Vent Terminal. See Figure 14.
a. Locate roof opening to allow vertical vent
penetration. Size opening to maintain minimum
clearance from combustible materials.
b. Install roof flashing.
c. Extend vent pipe to maintain minimum height
[H] above roof as specified in Table 9. Vent
terminal must be minimum 2 feet horizontally
from roof surface and minimum 8 feet from any
vertical wall or similar obstruction. Provide
bracing as required in Table 9.
Summary of Contents for INDEPENDENCE IN3PV
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Page 44: ...44 U S Boiler Company Inc P O Box 3020 Lancaster PA 17604 1 888 432 8887 www usboiler net...
