VENT TERMINATION CLEARANCES
FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA
INSIDE CORNER
DETAIL
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| L | C | B | B | I |
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| Fixed |
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| Operable |
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| Fixed | Closed | M | |
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| Closed |
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| Operable |
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| VENT TERMINAL | AIR SUPPLY INLET | AREA WHERE TERMINAL | |
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| IS NOT PERMITTED | |||
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| US Installations1 |
| Canadian Installations2 |
A = |
| Clearance above grade, veranda, | 12 inches (305mm) or 12 in. 305mm) | 12 inches (305mm) or 12 in. 305mm) | |
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| porch, deck or balcony | above average snow accumulation. | above average snow accumulation. | |
B = |
| Clearance to window or | 6 inches (152mm) for appliances <10,000 | 6 inches (152mm) for appliances <10,000 | |
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| door that may be opened | Btuh (3kw), 9 inches (mm) for appliances | Btuh (3kw), 12 inches (305mm) for | |
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| > 10,000 Btuh (3kw) and <50,000 Btuh | appliances > 10,000 Btuh (3kw) and | |
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| (15 kw), 12 inches (305mm) for ap- | <100,000 Btuh (30kw), 36 inches (.9m) | |
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| pliances > 50,000 Btuh (15kw) | for appliances > 100,000 Btuh (30kw) | |
C = |
| Clearance to permanently | * 12" |
| * 12" |
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| closed window |
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D = |
| Vertical clearance to ventilated soffit | * Equal to or greater than soffit depth |
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| located above the terminal within a | * Equal to or greater than soffit depth | ||
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| horizontal distance of 2 feet (mm) |
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| from the center line of the terminal |
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E = |
| Clearance to unventilated soffit | * Equal to or greater than soffit depth | * Equal to or greater than soffit depth | |
F = |
| Clearance to outside corner | * No minimum to outside corner | * No minimum to outside corner | |
G = |
| Clearance to inside corner | * |
| * |
H = Clearance to each side of center line ex- | 3 feet (.9m) within a height 15 feet (4.5m) | 3 feet (.9m) within a height 15 feet (4.5m) | |||
| tended above meter / regulator assembly | above the meter / regulator assembly | above the meter / regulator assembly | ||
I = |
| Clearance to service regulator | * 3 feet (.9m) |
| 3 feet (.9m) |
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| vent outlet |
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J = |
| Clearance to non−mechanical air | 6 inches (152mm) for appliances <10,000 | 6 inches (152mm) for appliances <10,000 | |
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| supply inlet to building or the com- | Btuh (3kw), 9 inches (mm) for appliances | Btuh (3kw), 12 inches (305mm) for | |
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| bustion air inlet to any other ap- | > 10,000 Btuh (3kw) and <50,000 Btuh | appliances > 10,000 Btuh (3kw) and | |
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| pliance | (15 kw), 12 inches (305mm) for ap- | <100,000 Btuh (30kw), 36 inches (.9m) | |
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| pliances > 50,000 Btuh (15kw) | for appliances > 100,000 Btuh (30kw) | |
K = |
| Clearance to mechanical air sup- | 3 feet (.9m) above if within 10 feet | 6 feet (1.8m) | |
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| ply inlet | (3m) horizontally |
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L = |
| Clearance above paved sidewalk or | * 7 feet (2.1m) |
| 7 feet (2.1m) |
| paved driveway located on public property |
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M = |
| Clearance under veranda, porch, | *12 inches (305mm) |
| 12 inches (305mm) |
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deck or balcony
1In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code
2In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
aved driveway that is located
between two single family dwellings and serves both dwellings.
sides beneath the floor. Lennox recommends avoiding this location if possible.
*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearance will be in accordance with local installation codes and the requirements of the gas supplier and these installation instructions."
FIGURE 18
Page 17
