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CAUTION | TO AVOID DOWNDRAFTS AND/OR COLD AIR | ||
| PROBLEMS, IT IS RECOMMENDED TO SEAL | ||
| OFF THE AREA BETWEEN THE TERMINATION | ||
| CAP AND THE TOP OF THE | ||
| CHIMNEY OPENING INTO WHICH THE VENT | ||
| CAP HAS BEEN INSTALLED. | ||
| WHEN USING THE | ||
| IT IS REQUIRED TO SEAL AROUND THE | ||
| FLEXIBLE VENT PIPES IN THE DAMPER AREA. | ||
| SEE FIGURE 3. USE FIBERGLASS INSULATION | ||
| OR OTHER SUITABLE | ||
| MATERIAL. |
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| VENT SYSTEM APPROVALS |
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| TABLE 1 |
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WARNING: MAJOR U.S. BUILDING
CODES SPECIFY MINIMUM CHIMNEY
AND/OR VENT HEIGHT ABOVE THE
ROOF TOP. THESE MINIMUM HEIGHTS
ARE NECESSARY IN THE INTEREST OF
SAFETY. FIGURE 2 SHOWS MINIMUM
HEIGHTS, PROVIDED THE
TERMINATION CAP IS AT LEAST 8-FEET
FROM A VERTICAL WALL.
NOTE: This also pertains to vertical vent systems installed on the outside of the building.
Termination
Cap
Roof Pitch | H (min.) ft. |
flat to 6/12 | 1.0 |
6/12 to 7/12 | 1.25 |
over 7/12 to 8/12 | 1.5 |
over 8/12 to 9/12 | 2.0 |
over 9/12 to 10/12 | 2.5 |
over 10/12 to 11/12 | 3.25 |
over 11/12 to 12/12 | 4.0 |
over 12/12 to 14/12 | 5.0 |
over 14/12 to 16/12 | 6.0 |
over 16/12 to 18/12 | 7.0 |
over 18/12 to 20/12 | 7.5 |
over 20/12 to 21/12 | 8.0 |