Initial Installation
QUALIFIED INSTALLERS ONLY
VENT TERMINATION RESTRICTIONS: |
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D | E |
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B |
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L | B | Fixed |
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F | Closed | Openable | Fixed |
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| Openable | Closed |
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| I | A | ||
| Termination Cap |
| Air Supply Inlet |
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| G | Gas Meter | Restriction Zone |
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| (Termination not allowed) |
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Figure 18. Vent Termination Restrictions, refer to Table 2.
Table 2: Vent termination clearances, refer to Figure 18.
Letter | Canadian Installation 1 | US Installation2 | Description |
A | 12 in (30 cm) | Clearance above grade, verandah, porch, deck, or balcony. | |
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B | 12 in (30 cm) | 9 in (23 cm) | Clearance from window or door that may be opened. |
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C | 12 in (30 cm)* | Clearance from permanently closed window (to prevent | |
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| condensation). |
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D | 24 in (60 cm)* | Vertical clearance to ventilated soffit located above the | |
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| terminal, within a horizontal distance of 2 ft (60 cm) from |
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| center line of terminal. |
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E | 18 in (45 cm)* | Clearance to unventilated soffit. | |
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F | 12 in (30 cm)* | Clearance to outside corner. | |
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G | 12 in (30 cm)* | Clearance to inside corner. | |
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H | 3 ft (91 cm) within a height of | 3 ft (91 cm) within a height of | Clearance to each side of center line extended above |
| 15 ft (4.5 m) above the meter/ | 15 ft (4.5 m) above the meter/ | meter/regulator assembly. |
| regulator assembly | regulator assembly* |
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I | 3 ft (91 cm) | 3 ft (91 cm)* | Radial clearance around service regulator vent outlet. |
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J | 12 in (30 cm) | 9 in (23 cm) | Clearance to |
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| the combustion air inlet to any other appliance. |
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K | 6 ft (1.83 m) | 3 ft (91 cm) above if within 10 | Clearance to mechanical air supply inlet. |
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| ft (3 m) horizontally |
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L | 7 ft (2.13 m)t | 7 ft (2.13 m)*t | Clearance above paved sidewalk or paved driveway located |
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| on public property. |
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M | 12 in / 30 cm+ | 12 in / 30 cm*+ | Clearance under verandah, porch, deck, or balcony. |
N | 12 in (30 cm)* | Clearance horizontally to any surface (such as an exterior | |
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| wall) for vertical terminations. |
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O | 12 in (30 cm) | Clearance above roof line for vertical terminations. | |
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1In accordance with the current CSA B149, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1 NFPA 54, National Fuel Gas Code.
* These numbers are only estimates. Clearance in accordance with installation codes and the requirements of the gas supplier.
t A vent shall not terminate directly above a side walk or paved driveway that is located between two single family dwellings and it serves both dwellings. + Permitted only if verandah, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
NOTE: Venting terminals shall not be recessed into walls or siding.
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