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 sufficient size to meet minimum requirements for Clearance to Combustibles, as specified. 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 finish 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 33. Tighten the clamp around the pipe section. Use a level to make sure the pipe is truly vertical. With roofing 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 flashing.

STEP 7. Slip the flashing over the pipe section protruding through the roof. Secure the base of the flashing to the roof with roofing nails. Use a non-hardening sealant between the uphill edge of the flashing and the roof. Insure the roofing material overlaps the top edge of the flashing. 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 34 and Table 6. 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 flashing as shown in Figure 33. Use the non-hardening sealant around the joint between the pipe and the storm collar.

STEP 10. Twist-lock the vent cap.

Figure 34: Height of Vertical Termination;

Reference Table 6.

Table 6: Minimum ‘H’ for Figure 34.

Roof Pitch

Minimum Height (H)

 

 

 

 

Feet

Meters

 

 

 

Flat to 7/8

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

 

 

 

26

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Enviro 50-645, C-11278, C-10078 owner manual Roof Pitch Minimum Height H Feet Meters
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50-645, C-10078, C-11278 specifications

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