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| Certified Vent | Vent and |
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| 1 | (ft) | Combustion | Vertical Air |
| Intake Air |
| Vertical Vent Height | Air Intake | ||||
Model No. | Material | Vent Size |
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| Pipe | Inlet Max. |
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| (in.) |
| Min. | Max. |
| Material | Length* (ft) |
300 | (Canada Only: |
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| and CPVC) | 4 |
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| Galvanized |
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500 | Stainless Steel, | 0 | 100 |
| 100 | |||
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| ANSI/ASTM D1785 |
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| PVC, ABS, |
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| Sch 40 PVC, |
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850 | ANSI/ASTM F441 | 6 |
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Sch 40 CPVC |
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1 Vent lengths are based on a lateral length of 2 ft. Refer to the latest edition of the NFGC for further details. | ||
* Subtract 10 ft per elbow. Max. 4 elbows. |
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Table L: Category IV Vertical Vent & Vertical Direct Vent |
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Installation | The distance of the vent terminal from adjacent public | |
The maximum and minimum venting length for this | walkways, adjacent buildings, open windows and | |
building openings must be consistent with the NFGC | ||
Category IV appliance shall be determined per the | (U.S.) or B149 (Canada). | Vents supported only by |
NFGC (U.S.) or B149 (Canada). | flashing and extending above the roof more than 5 ft | |
should be securely guyed or braced to withstand snow | ||
The diameter of vent flue pipe should be sized accord- | and wind loads. |
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ing to the NFGC (U.S.) and Appendix B of B149 |
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(Canada). The minimum flue pipe diameter for con- |
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ventional venting is: 4 in. (102mm) for Models 300 and |
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500, and 6 in. (152mm) for Model 850. |
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The connection from the appliance vent to the stack |
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must be as direct as possible and shall be the same di- |
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ameter as the vent outlet. The horizontal breaching of |
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a vent must have an upward slope of not less than 1/4 |
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inch per linear foot from the heater to the vent termi- |
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nal. The horizontal portions of the vent shall also be |
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supported for the design and weight of the material |
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employed to maintain clearances and to prevent physi- |
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cal damage or separation of joints. |
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NOTE: A vent adapter |
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quired to connect the Category IV vent to the boiler. |
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Termination |
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The vent terminal should be vertical and should termi- |
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nate outside the building at least 2 ft above the highest |
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point of the roof that is within 10 ft. The vent cap |
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should have a minimum clearance of 4 ft horizontally |
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from and in no case above or below (unless a 4 ft hori- |
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zontal distance is maintained) electric meters, gas |
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meters, regulators and relief equipment. | Fig. 20: Vertical Venting | |
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26
