6.7.4Recommended vent/air intake terminal position
Terminals should be positioned as to avoid products of combustion entering openings into buildings or other vents.
Maintain 12” of clearance above the highest anticipated snow level or grade or, whichever is greater. Please refer to your local codes for the snow level in your area.
| Terminal positions |
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Ref | Description | Canadian Installations - Direct Vent | US Installations Direct Vent | US Installations |
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| non Direct Vent |
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A | Clearance above grade, veranda, porch, | 12 inches (30 cm) | 12 inches (30 cm) | 12 inches (30 cm) |
| deck, or balcony |
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B | Clearance to window or door that may | 6 inches (15 cm) for appliances < 10,000 | 6 inches (15 cm) for appliances < 10,000 | 4 feet (1.2 m) below or to |
| be opened | Btuh (3 kW), 12 inches (30 cm) for ap- | Btuh (3 kW), 9 inches (30 cm) for ap- | side of opening; 1 foot (300 |
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| pliances > 10,000 Btuh (3 kW) and < | pliances > 10,000 Btuh (3 kW) and < | mm) above opening |
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| 100,000 Btuh (30 kW), 36 inches (91 cm) | 50,000 Btuh (30 kW), 12 inches (91 cm) |
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| for appliances > 100,000 Btuh (30 kW) | for appliances > 50,000 Btuh (30 kW) |
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C | Clearance to permanently closed window | * | * | * |
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D | Vertical clearance to ventilated sof- | * | * | * |
| fit, located above the terminal within a |
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| horizontal distance of 2 feet (61 cm) from |
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| 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 ex- | 3 feet (91 cm) within a height 15 feet (4.5 | * | * |
| tended above meter/regulator assembly | m) above the meter/regulator assembly |
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I | Clearance to service regulator vent outlet | 36 inches (91 cm) | * | * |
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J | Clearance to nonmechanical air supply | 6 inches (15 cm) for appliances < 10,000 | 6 inches (15 cm) for appliances < 10,000 | 4 feet (1.2 m) below or to |
| inlet to building or the combustion air inlet | Btuh (3 kW), 12 inches (30 cm) for ap- | Btuh (3 kW), 9 inches (30 cm) for ap- | side of opening; 1 foot (300 |
| to any other appliance | pliances > 10,000 Btuh (3 kW) and < | pliances > 10,000 Btuh (3 kW) and < | mm) above opening |
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| 100,000 Btuh (30 kW), 36 inches (91 cm) | 50,000 Btuh (30 kW), 12 inches (91 cm) |
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| for appliances > 100,000 Btuh (30 kW) | for appliances > 50,000 Btuh (30 kW) |
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K | Clearance to a mechanical air supply | 6 feet (1.83 m) | 3 feet (91 cm) above if within 10 feet (3 | 3 feet (91 cm) above if wit- |
| inlet |
| m) horizontally | hin 10 feet (3 m) horizontally |
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L | Clearance above paved sidewalk or | 7 feet (2.13 m) [1] | * | 7 feet (2.13 m) |
| paved driveway located on public |
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M | Clearance under veranda, porch, deck, | 12 inches (30 cm) [2] | * | * |
| or balcony |
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[1]A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
[2]Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances are in accordance with local installation codes and the requirements of the gas supplier.
clearances of venting system terminals | table 6 |
Installation & Servicing Instructions Rinnai
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