STANDARD VENT - VERTICAL (CATEGORY I)
IMPORTANT!
VENT PRESSURE MUST BE MAINTAINED BETWEEN
Figure 5.
TABLE 7. STANDARD VERTICAL VENTING (CATEGORY I)
| APPLIANCE | CERTIFIED | EXHAUST | MAXIMUM LENGTH WITHOUT | |
MODEL | CATEGORY | VENTING | VENT SIZE | BAROMETRIC DAMPER (FEET) | |
|
| MATERIAL | (INCHES) |
| |
I000 | I | TYPE B OR | 10”(25.4 cm) | 35 Feet (10.7 m) without damper | |
EQUIVALENT |
| *70 Feet (21.3 m) max. with damper | |||
|
|
| |||
1300 | I | TYPE B OR |
| 35 Feet (10.7 m) without damper | |
1500 | EQUIVALENT | 12" (30.5 cm) | *70 Feet (21.3 m) max. with damper | ||
| |||||
1850 | I | TYPE B OR | 14"(35.6 cm) | 35 Feet (10.7 m) without damper | |
2100 | EQUIVALENT |
| *70 Feet (21.3 m) max. with damper | ||
|
| ||||
2500 | I | TYPE B OR | 16" (40.6 cm) | 35 Feet (10.7 m) without damper | |
EQUIVALENT |
| *70 Feet (21.3 m) max. with damper | |||
|
|
|
*Extending venting over 70 feet (21.3 m) may require special considerations.
•Connection for the appliance exhaust vent to the stack must be as direct as possible. Maximum and minimum venting length for Category I appliances shall be determined per the latest edition of the National Fuel Code (U.S.) and
•The horizontal breaching of a vent must have an upward slope of not less than 1/4 inch per linear foot (2 cm/m) from the boiler to the vent terminal. The horizontal portion of the vent shall be supported to maintain clearances and to prevent physical damage or separation of joints.
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