Venting
Gas Vent Rule – Gas vent caps are not permitted within 8 feet (2.4 mm) of a vertical wall or similar obstruction. Gas vent caps that are located 8' or more from a portion of a building which extends at an angle greater than 45° upward from the horizontal may terminate in accordance with the table in Figure 4, provided that in no case shall any discharge opening on the cap be less than 2' (610 mm) horizontally from the roof surface (National Fuel Gas Code ANSI Z223.1 (NFPA 54) 7.6.2) (CAN/CGA B149).
X
12
Roof Pitch is X/12
Minimum Height from Roof to Lowest Discharge Opening
| Minimum Height | |
Roof Slope | from Roof to Lowest | |
Discharge Opening | ||
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| Feet | Meters |
Flat to 6/12 | 1' 0" | 0.3 |
Over 7/12 to 9/12 | 2' 0" | 0.6 |
APPLIANCE CLEARANCES
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Back | 1/2 in. (13mm) | 1/2 in. (13mm) | |
| 0 in. (0 mm) to spacers | ||
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Sides | 1/2 in. (13mm)** | 1/2 in. (13mm)** | |
| 0 in. (0 mm) to spacers | ||
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Top Spacers | 0 in. (0 mm) | ||
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Floor | 0 in. (0 mm) | ||
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*From |
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Bottom of | 65 1/2 in. (1664 mm) | 67 1/2 in. (1715 mm) | |
Unit to | |||
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Ceiling |
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Vent | 1 in. (25.4 mm) | ||
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| SERVICE CLEARANCE | ||
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Front | 3 Feet (0.9 meters) | ||
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*Note: See also Figure 32 on page 14 for an illustration of this clearance, for clearances to a sidewall and for mantel clearances.
**Note: The nailing tabs and the area directly behind the nailing tabs are exempt from the clearances described in the above table. See Figure 9 on page 8.
Table 3
FRAMING SPECIFICATIONS
Use Only 2x4 or Larger
Lumber
Over 10/12 to 12/12 | 4' 0" | 1.2 |
Over 13/12 to 16/12 | 6' 0" | 1.8 |
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Over 17/12 to 21/12 | 8' 0" | 2.4 |
Note: Venting terminals shall not be recessed into a wall or siding.
Figure 4
Header
E
D
A
*C
Note: If the Outside Combustion Air Kit is to be installed, it must be installed before the appliance is framed and enclosed in the finishing walls.
B
Gas Supply Line
Left or Right Side - 5500
Right Side Only - 6500
6
*Note: The framed depth - dimension “C”- from a framed wall, must always be measured from a finished surface. If a wall covering such as drywall is to be attached to the rear wall, then dimension “C” must be measured from the drywall surface. It is important that this dimension be exact.
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| A | B | C | D | E | |
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| in. | 33 1/4 | 38 3/4 | 15 1/2 | 8 1/2 | 8 1/2 | ||
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| mm | 845 | 984 | 394 | 216 | 216 | ||
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| in. | 40 3/4 | 40 3/4 | 18 | 6 1/2 | 5 | ||
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Figure 5 | mm | 1035 | 1035 | 457 | 165 | 127 | ||
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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. |
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