D
E
V
B
V
L
G
v
A
| C | |
v | FIXED | |
CLOSED | ||
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| OPERABLE | |
v |
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F |
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| B |
H
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| B | v |
B |
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| FIXED | |
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| SED |
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| RABLE | CLO |
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| OPE |
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| v |
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B |
| v |
| X |
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| B | A | J |
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I
v | X | |
K | ||
M | ||
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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 indoor and outdoor tankless water heaters.
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| Canadian Installations 1 | US Installations 2 | US Installations 2 |
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| Indoor and Outdoor | Indoor | Outdoor |
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A= | Clearance above grade, veranda, | 12 inches (30 cm) above anticipated | 12 inches (30 cm) above anticipated | 12 inches (30 cm) above anticipated |
| porch, deck or balcony. | |||
| snow level. | 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) | |
| Btuh (3 kW), 12 inches (30 cm) for | 4 feet (1.2 m) below or to side of | ||
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| for appliances > 10,000 Btuh (3kW) | ||
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| appliances > 10,000 Btuh (3kW) and < | opening; 1 foot (300 mm) above | |
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| and < 50,000 Btuh (15kW), 12 inches | ||
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| 100,000 Btuh (30kW), 36 inches (91 cm) | opening. | |
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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 |
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| 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 corner. | * | * | * |
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H = Clearance to each side of center | 3 feet (91 cm) within a height 15 feet |
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| line extended meter/regulator | * |
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| (4.57 m) above the meter/regulator | * | ||
| assembly. above | |||
| 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 < |
| 6 inches (15 cm) for appliances < 10,000 |
| supply inlet to the combustion air | 10,000 Btuh (3 kW), 12 inches (30 cm) |
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| 4 feet (1.2 m) below or to side of | Btuh (3 kW), 9 inches (23 cm) for | ||
| inlet to any building or other | for appliances > 10,000 Btuh (3kW) | ||
| opening; 1 foot (300 mm) above | appliances > 10,000 Btuh (3kW) and < | ||
| appliance. | and < 100,000 Btuh (30kW), 36 inches | ||
| opening. | 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 | 6 feet (1.83 m) | 3 feet (91 cm) above if within 10 feet | 3 feet (91 cm) above if within 10 feet |
| supply inlet. | (3 m) horizontally. | (3 m) horizontally. | |
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L = | Clearance above paved sidewalk |
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| or paved driveway located on | Not Allowed | Not Allowed | Not Allowed |
| public property. |
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M = Clearance under veranda, porch, | Not Allowed | Not Allowed | Not Allowed | |
| deck or balcony. | |||
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*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, or other |
| areas where condensate or vapor could create a nuisance, hazard or cause property damage, or where condensate or vapor could cause damage |
12 | or could be detrimental to the operation of regulators, relief valves or other equipment. |
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