Page 10 | ΒΡΑΔΦΟΡΔ ΩΗΙΤΕ ΧΟΡΠ. |
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U.S. Installations (see note 1) | Canadian Installations (see note 2) |
A= Clearance above grade, veranda, porch, 12 inches (30 cm) | 12 inches (30 cm) |
deck, or balcony |
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B= Clearance to window or door that may be opened
4 feet (1.2 m) below or to side of opening; | 36 inches (91 cm) |
1 foot (30 cm) above opening |
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C= | Clearance to permanently closed window | See note 4 | See note 5 |
D= | Vertical clearance to ventilated soffit located |
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| above the terminal within a horizontal | See note 4 | See note 5 |
| distance of 2 feet (61cm) from the center line |
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| of the terminal |
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E= | Clearance to unventilated soffit | See note 4 | See note 5 |
F= | Clearance to outside corner | See note 4 | See note 5 |
G= | Clearance to inside corner | See note 4 | See note 5 |
H= | Clearance to each side of center line |
| 3 feet (91 cm) within a height 15 feet above |
| extended above meter/regulator assembly | See note 4 | the meter/regulator assembly |
I= | Clearance to service regulator vent outlet | See note 4 | 3 feet (91 cm) |
J= | Clearance to nonmechanical air supply inlet |
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| to building or the combustion air inlet to | 4 feet (1.2 m) below or to side of opening; | 36 inches (91 cm) |
| any other appliance | 1 foot (30 cm) above opening |
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K= | Clearance to a mechanical air supply inlet | 3 feet (91 cm) above if within 10 feet (3 m) | 6 feet (1.83 m) |
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| horizontally |
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| Vent termination not allowed in this location |
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| Vent termination not allowed in this location | for category IV appliances. A vent shall not |
L= | Clearance above paved sidewalk or paved | for category IV appliances. For Category III | terminate directly above a sidewalk or paved |
| driveway located on public property | appliances, vent must terminate at least 7 | driveway that is located between two single |
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| feet (2.13m) above the sidewalk or driveway. | family dwellings and serves both dwellings. |
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| For Category III appliances that do not violate |
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| the previous condition, vent must terminate at |
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| least 7 feet (2.13m) above the sidewalk or |
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| driveway. |
M= | Clearance under veranda, porch, deck, | See note 4 | 12 inches (30 cm) (see note 3) |
| or balcony |
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Notes:
1.In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2.In accordance with the current
3.Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
4.For clearances not specified in ANSI Z223.1 / NFPA 54, clearance is in accordance with local installation codes and the requirements of the gas supplier.
5.For clearances not specified in
*When vent terminal is less than 10 feet (3m) horizontally from a forced air inlet, the terminal must be at least 3 feet (0.9m) above the air inlet.
