D
| E |
V | B |
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| V |
L |
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F
G
v
A
| C |
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v | FIXED | |
| ED | |
| OS | |
| CL |
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| E |
| ERABL | |
| OP |
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v |
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| B |
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| B | v |
B |
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| D | |
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| FIXEED |
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| BLE | OS |
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| CL |
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| ERA |
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| OP |
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| v |
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B |
| v |
| X |
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| B | A | J |
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H
I
v
M
X K
V
Vent Terminal | X Air Supply Inlet | Area Where Terminal is NOT Permitted |
Horizontal Vent Terminal Location |
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The following information should be used for determining the proper location of the vent terminal for direct vent tankless water heaters..
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| Canadian Installations 1 | US Installations 2 |
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A= | Clearance above grade, veranda, | 12 inches (30 cm) above anticipated | 12 inches (30 cm) above anticipated |
| porch, deck or balcony.. | ||
| snow level.. | snow level.. | |
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B= | Clearance to window or door that | 6 inches (15 cm) for appliances < 10,000 | 6 inches (15 cm) for appliances < |
| may be opened.. | ||
| 10,000 Btuh (3 kW), 9 inches (23 cm) | ||
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| Btuh (3 kW), 12 inches (30 cm) for | |
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| for appliances > 10,000 Btuh (3kW) | |
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| appliances > 10,000 Btuh (3kW) and < | |
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| and < 50,000 Btuh (15kW), 12 inches | |
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| 100,000 Btuh (30kW), 36 inches (91 cm) | |
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| (30 cm) for appliances > 50,000 Btuh | |
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| for appliances > 100,000 Btuh (30kW).. | |
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| (15kW).. | |
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C= | Clearance to permanently closed | * | * |
| window.. | ||
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D= | Vertical Clearance to ventilated |
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| soffit located above the terminal |
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| within a horizontal distance of 2 | * | * |
| feet (61 cm) from the center line of | ||
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| the terminal.. |
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E= | Clearance to unventilated soffit.. | * | * |
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F= | Clearance to outside corner.. | * | * |
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G= | Clearance to corner.. | * | * |
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H = Clearance to each side of center line | 3 feet (91 cm) within a height 15 feet |
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| extended meter/regulator assembly.. |
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| (4..57 m) above the meter/regulator | * | |
| above | ||
| assembly.. |
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I = | Clearance to service regulator | 3 feet (91 cm) | * |
| coaxial vent outlet.. | ||
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J = | Clearance to nonmechanical air | 6 inches (15 cm) for appliances < | 6 inches (15 cm) for appliances < 10,000 |
| supply inlet to the combustion | 10,000 Btuh (3 kW), 12 inches (30 cm) | |
| air inlet to any building or other | for appliances > 10,000 Btuh (3kW) | Btuh (3 kW), 9 inches (23 cm) for |
| appliances > 10,000 Btuh (3kW) and < | ||
| appliance.. | and < 100,000 Btuh (30kW), 36 inches | |
| 50,000 Btuh (15kW), 12 inches (30 cm) | ||
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| (91 cm) for appliances > 100,000 Btuh | |
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| for appliances > 50,000 Btuh (15kW).. | |
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| (30kW).. | |
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K = | Clearance to mechanical air supply | 6 feet (1..83 m) | 3 feet (91 cm) above if within 10 feet |
| inlet.. | (3 m) horizontally.. | |
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L = | Clearance above paved sidewalk or |
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| paved driveway located on public | 7 feet (2..13 m)† | * |
| property.. |
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M = Clearance under veranda, porch, | Not Allowed | Not Allowed | |
| deck or balcony.. | ||
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1In accordance with current
2In accordance with current ANSI Z223..1/ NFPA 54 National Fuel Gas Code..
†A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings..
* For clearances not specified in ANSI 223..1/NFPA 54 or |
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a) | A minmum clearance value determined by testing in accordance with section 2..20, or; |
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b) | A reference to the following footnote: "Clearance in accordance with local installtion codes and the require- | 11 |
| ments of the gas supplier.." | |