6.See Table 4 for height of vent termination above the roof.
7.Do not run the heater vent into a common vent with any other appliance.
8.
Fire Hazard. Do not vent the heater directly into a masonry chimney. Installation into a masonry chimney must use a chimney liner and must meet National Fuel Gas Code requirements and all local code requirements.
Table 4: Vent Termination Height vs. Roof Pitch
| Minimum Height |
Roof Pitch | Above Roof* |
|
|
Flat to 6/12 | 1 Ft. |
6/12 to 7/12 | 1 Ft. 3 in. |
>7/12 to 8/12 | 1 Ft. 6 in. |
>8/12 to 9/12 | 2 Ft. |
>9/12 to 10/12 | 2 Ft. 6 in. |
>10/12 to 11/12 | 3 Ft. 4 in. |
>11/12 to 12/12 | 4 Ft. |
>12/12 to 14/12 | 5 Ft. |
>14/12 to 16/12 | 6 Ft. |
>16/12 to 18/12 | 7 Ft. |
>18/12 to 20/12 | 7 Ft. 6 in. |
>20/12 to 21/12 | 8 Ft. |
* Vent must be at least eight (8) feet away from nearest vertical surface. Vents extending five (5) feet or more above the roof must be braced or guyed. Consult your local code officials for detailed information.
Listed |
Termination |
Cap |
Min. 8 Ft.
See Table 4
Storm Collar
For Min. Hght.
Flashing
6" Minimum Clearance to
Combustible 
Materials
HORIZONTAL OR VERTICAL VENTING - POSITIVE PRESSURE (SPECIAL GAS VENTING)
(See Figures 13 and 14)
Vent the heater either horizontally or vertically using one of the
Maintain clearance between the vent pipe and combustible surfaces according to the vent manufacturer’s instructions and code requirements. Do not place any insulating mate- rials around the vent or inside the required clear air space surrounding the vent. See Table 6 (Page 15) for maximum permissable vent lengths. See Table 7 (Page 15) for Listed vent components.
CONNECTING SPECIAL GAS
VENT TO THE HEATER
Metallic:
1.Order an Appliance Adapter kit:
2.Remove the outside vent cover.
3.Install the Appliance Adapter in the Vent Body of the heater (located under the outside Vent Cover). Before connecting the Appliance Adapter to the Vent Body, wet a clean cloth or paper towel with isopropyl alco- hol (rubbing alcohol) and vigorously wipe the socket of the Vent Body. Immediately wipe the cleaned sur- faces dry with a clean cloth or paper towel. Repeat for the exterior of the heater end of the Appliance Adapter. Attach the Appliance Adapter to the vent body using the adhesive specified by the vent manufacturer, fol- lowing the vent manufacturer’s instructions.
Risk of carbon monoxide poisoning if adapter is improperly attached. Mechanical connections (such as screws) can cause cracking and leaks in the adapter. Do not drill holes or use screws to connect the appliance adapter to the heater vent body. Attach with manufacturer’s specified adhesive.
Class B Double Wall
Metal Vent Pipe
Metal Flue
Firestop 
Risk of fire or asphyxiation if vent is not assembled according to manufacturer’s instructions or if
Vent
Collar
Support Vertical
vent parts from different manufacturers are mixed. Vent
Body
Vent Pipe so adapter does not take weight of pipe.
parts from different manufacturers ARE NOT interchange- able. Mixing parts from more than one manufacturer may cause leaks or damage to vent. When installing a vent, pick one manufacturer and be sure that all vent parts come
FIGURE 12: Typical Metal Vent Pipe Installation (Vertical – Negative Pressure)
from that manufacturer and are specified by the manufac- turer for your system. Follow manufacturer’s instructions and local and National Fuel Gas Code requirements care- fully during assembly and installation.
13