Enviro S50 - Vertical Venting Notes and Connections; Minimum Height Requirements Table

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Initial Installation
QUALIFIED INSTALLERS ONLY
STEP 5� Cut hole in the roof centered on the small hole placed in the roof from Step 2. The hole should be of
sucient size to meet minimum requirements for Clearance to Combustibles, as specied. Continue
to assemble lengths of pipe and elbows necessary to reach from the ceiling support box up through
the roof line. Galvanized pipe and elbows may be utilized in the attic, as well as above the roof line.
The galvanized nish is desirable above the roof line, due to the higher corrosion resistance.
STEP 6� Once the pipe sections have been joined, and run up through the hole in the roof, slip an elbow
strap over the exposed sections, bend the support straps outwards, and push the elbow strap down
to the roof level, as shown in Figure 55. Tighten the clamp around the pipe section. Use a level to
make sure the pipe is truly vertical. With roong nails, secure the support straps to the roof. Seal
the nails holes heads with non-hardening mastic. Trim the excess length of the support straps that
extend out beyond the edge of the ashing.
STEP 7� Slip the ashing over the pipe section protruding through the roof. Secure the base of the ashing
to the roof with roong nails. Use a non-hardening sealant between the uphill edge of the ashing
and the roof. Insure the roong material overlaps the top edge of the ashing. Verify that you have
at least the minimum clearance to combustibles at the roof line.
STEP 8� Continue to add pipe sections until the height of the vent cap meets the minimum code requirements.
Refer to Figure 56 and Table 8. Note that for steep roof pitches, the vent height must be increased.
In high wind conditions, nearby trees, adjoining roof lines, steep pitched roofs, and other similar
factors can result in poor draft, or down drafting. In these cases, increasing the vent height may
solve the problem.
STEP 9� Slip the storm collar over the pipe, and push it down to the top of the roof ashing as shown in
Figure 55. Use the non-hardening sealant around the joint between the pipe and the storm collar.
STEP 10� Twist-lock the vent cap.
H
Dimension ‘H’ obtained
from table below
Roof Pitch Minimum Height (H)
Feet Meters
Flat to 7/12 1 0.3
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/12 to 12/12 4 1.22
Over 12/12 to 14/12 5 1.52
Over 14/12 to 16/12 6 1.83
Over 16/12 to 18/12 7 2.13
Over 18/12 to 20/12 7.5 2.29
Over 20/12 to 21/12 8 2.44
Figure 56: Height of Vertical Termination; Reference
Table 8�
Table 8: Minimum ‘H’ for Figure 56.