H.Indoor Air Installation – See Figures 12, 13, 14, 15 and 16.
1.Do not exceed maximum vent length. Refer to Table 4.
Horizontal –
2.Maintain minimum ¼ inch per foot slope in horizontal runs. Position weld seams in vent pipes, in all horizontal runs, at the top to avoid condensate from lying on the seams.
3Recommended horizontal installation consists of vent being sloped down away from boiler. See Figure 12.
4.Alternate horizontal installation consists of vent being sloped down toward the boiler. A horizontal vent tee is required. See Figure 13.
5.Use appropriately designed thimbles when passing through combustible walls (thimble use optional for noncombustible walls). Insert thimble through wall from outside. Secure outside flange to wall with nails or screws, and seal with sealant material.
Install inside flange to inside wall, secure with nails or screws, and seal with sealant material.
6.For noncombustible wall application when thimble is not used, size opening such that female (bell) end with locking band attached cannot pass through.
7.Join vent terminal to vent pipe. Locate vent terminal between seventeen (17) inches and twenty- nine (29) inches from wall when joined to inside vent piping. See Figure 14.
8.Insert vent pipe through thimble/opening from outside and join to vent system. Apply sealant between vent pipe and opening/thimble to provide weathertight seal.
Vertical –
10.Installation of a vertical vent drain tee is required on all vertical vent applications. See Figure 6. Attach vertical vent drain tee directly to elbow or horizontal pipe from an elbow immediately after vent connector.
11.Install fire stops where vent passes through floors, ceilings or framed walls. The fire stop must close the opening between the vent pipe and the structure. Fire stop manufacturers are
12.Whenever possible install vent straight through roof. Refer to Figure 6. Maintain minimum clearance to combustible materials. For attic offset see Figure 7.
13.Install Vent Terminal.
a.Size roof opening to maintain minimum clearance from combustible materials.
b.Use appropriately designed vent flashing when passing through roofs. Follow flashing manufacturers’ instructions for installation procedures. Flashing manufacturers are Air- Jet, American Metal Products, Metal Fab, and Simpson
c.Extend vent pipe to maintain minimum vertical and horizontal distance of twelve (12) inches from roof surface. Allow additional vertical distance for expected snow accumulation. Provide brace as required. Refer to Figure 15.
d.Vertical venting requires flashing and a storm collar to prevent moisture from entering the structure.
e.Install storm collar on vent pipe immediately above flashing. Apply Dow Corning Silastic 732
RTV Sealant between vent pipe and storm collar to provide weathertight seal.
f.Attach vent terminal.
Vent Terminal and Air Intake Terminal –
14.Join vent terminal to 45° elbow (supplied by installer). Join 45° elbow/terminal assembly to vent pipe. Refer to Section C for proper procedures for joining vent pipe and fittings. See Figure 3.
15.Install supplied air intake terminal. See Figure 16.
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