Flue Terminal Clearances (ANS Z21.10.3, CSA 4.3)
INSIDE
CORNER DETAIL
G
H 
D
E
B
L
A
C
FIXED
CLOSED
OPERABLE
| B |
B | FIXED |
CLOSED | |
| OPERABLE |
B | J |
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| B |
| A |
I M
K 
X AIR SUPPLY INLET
V
F
B 
VENT TERMINAL
AREA WHERE TERMINAL IS NOT PERMITTTED
Ref | Description | Canadian Installations | US Installations | |
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A | Clearance above grade, veranda, porch, deck, or balcony | 12 inches (30 cm) | 12 inches (30 cm) | |
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B | Clearance to window or door that may be opened | 36 inches (91 cm) | 12 inches (30 cm) | |
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C | Clearance to permanently closed window | * | * | |
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| Vertical clearance to ventilated soffit, located above the terminal |
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D | within a horizontal distance of 2 feet (61 cm) 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 extended above meter/ | 3 feet (91 cm) within a height |
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15 feet (4.5 m) above the | * | |||
regulator assembly | ||||
| 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 inlet to building or the | 36 inches (91 cm) | 12 inches (30 cm) | |
combustion air inlet to any other appliance | ||||
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K | Clearance to a mechanical air supply inlet | 6 feet (1.83 m) | 3 feet (91 cm) above if within | |
10 feet (3 m) horizontally | ||||
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L | Clearance above paved sidewalk or paved driveway located on | 7 feet (2.13 m) 1 | * | |
public property | ||||
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M | Clearance under veranda, porch, deck, or balcony | 12 inches (30 cm) 2 | * | |
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1A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
2Permitted 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.
Clearance to opposite wall is 24 inches (60 cm) for Canada and US.
Manual - Rinnai Condensing Water Heaters | 27 |
