D
| E |
V | B |
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| V |
L |
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G
v
A
| C |
| ED |
v | FIX |
ED | |
| CLOS |
| LE |
| AB |
| ER |
| OP |
v |
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F |
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| B |
H
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| C |
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| M |
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| v |
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B |
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| D |
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| FIXE |
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| SED |
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| RABLE | CLO |
| I |
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| v | OPE |
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| v | |
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| X | ||
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B |
| v |
| X |
| K |
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| B | A | J |
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V VENT TERMINAL | X AIR SUPPLY INLET | AREA WHERE TERMINAL IS NOT PERMITTED |
Horizontal Vent Terminal Location
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 |
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 < 10,000 |
| may be opened. | Btuh (3 kW), 12 inches (30 cm) for | Btuh (3 kW), 9 inches (23 cm) for |
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| appliances > 10,000 Btuh (3kW) and < | appliances > 10,000 Btuh (3 kW) and |
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| 100,000 Btuh (30kW), 36 inches (91 cm) | < 50,000 Btuh (15 kW), 12 inches |
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| for appliances > 100,000 Btuh (30kW). | (30 cm) for appliances > 50,000 Btuh |
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| (15 kW). |
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C= Clearance to permanently closed | * | * | |
| window. |
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D= | Vertical Clearance to ventilated soffit | * | * |
| located above the terminal within a |
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| horizontal distance of 2 feet (61 cm) |
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| from the center line of 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 inside corner. | * | * |
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H = Clearance to each side of center line | 3 feet (91 cm) within a height 15 feet | * | |
| extended meter/regulator assembly. | ||
| (4.57 m) above the meter/regulator |
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| above |
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| assembly. |
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I = | Clearance to service regulator vent | 3 feet (91 cm) | * |
| |||
| outlet. |
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J = | Clearance to nonmechanical air | 6 inches (15 cm) for appliances < 10,000 | 6 inches (15 cm) for appliances < 10,000 |
| supply inlet to the combustion air | Btuh (3 kW), 12 inches (30 cm) for | Btuh (3 kW), 9 inches (23 cm) for |
| inlet to any building or other | appliances > 10,000 Btuh (3kW) and | appliances > 10,000 Btuh (3 kW) and |
| appliance. | < 100,000 Btuh (30kW), 36 inches (91 | < 50,000 Btuh (15 kW), 12 inches |
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| cm) for appliances > 100,000 Btuh | (30 cm) for appliances > 50,000 Btuh |
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| (30kW). | (15 kW). |
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K = | Clearance to mechanical air supply | 6 feet (1.83 m) | 3 feet (91 cm) above if within 10 feet |
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| inlet. |
| (3 m) horizontally. |
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L = | Clearance above paved side walk or | Not allowed | Not allowed |
| paved driveway located on public |
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| property. |
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M = Clearance under veranda, porch, | Not allowed | Not allowed | |
| deck or balcony. |
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1 In accordance with current
2 In 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.
*If clearances are not specified then follow local installation codes and the requirement of the gas supplier.
**For condensing appliances: The vent for this appliance shall not terminate over public walkways, near soffit vents, crawl space vents, of other areas where condensate or vapor could create a nuisance, hazard, or cause property damage. Where condensate or vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.
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