VENT CLEARANCES
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L | V | B |
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B
FIGURE 17: Home Layout
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V
A
H
B B
BI
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| J |
B
OPERABLE
M | X |
V | |
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FIXED
CLOSED
VVENT TERMINAL
XAIR SUPPLY
AREA WHERE TERMINAL IS NOT PERMITTED
Direct Vent Terminal Clearances | Canadian Installations1,3 | US Installation2,3 | ||
A. Clearance above grade, veranda, porch, deck, or | 12 inches (30 cm) | 12 inches (30 cm) | ||
| balcony |
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B. Clearance to window or door that may be opened | 12 inches (30 cm) for models ≤100,000 BTUH (30 kW), | |||
for models ≤50,000 BTUH (15 kW), 12 inches (30 cm) | ||||
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| 36 inches (91 cm) for models >100,000 BTUH (30 kW) | for models >50,000 BTUH (15 kW). †† | |
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C. Clearance to permanently closed window | 12 inches (30 cm) | 12 inches (30 cm) | ||
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D. Vertical clearance to ventilated soffit located | 12 inches (30 cm) or in accordance with local | 12 inches (30 cm) or in accordance with local | ||
| above the terminal within a horizontal distance | installation codes and the requirements of the gas | installation codes and the requirements of the gas sup- | |
| of 2 feet (61 cm) from the center line of the terminal | supplier. | plier | |
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| 12 inches (30 cm) or in accordance with local | 12 inches (30 cm) or in accordance with local | |
E. Clearance to unventilated soffit | installation codes and the requirements of the gas | installation codes and the requirements of the gas | ||
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| 12 inches (30 cm) or in accordance with local | 12 inches (30 cm) or in accordance with local | |
F. | Clearance to outside corner | installation codes and the requirements of the gas | installation codes and the requirements of the gas | |
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| supplier | supplier | |
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G. Clearance to inside corner | 3 feet (91 cm) | 3 feet (91 cm) | ||
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| Above a meter/regulator assembly within 3 feet (91 cm) | Above a meter/regulator assembly within 3 feet (91 | |
H. Clearance to each side of center line | horizontally of the vertical | cm) horizontally of the vertical | ||
| extended above meter/regulator assembly | vent outlet to a maximum vertical distance of 15 feet | tor vent outlet to a maximum vertical distance of 15 | |
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| (4.5 cm) above the meter/regulator assembly. | feet (4.5 cm) above the meter/regulator assembly. | |
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I. | Clearance to service regulator vent outlet | 3 feet (91 cm) | 3 feet (91 cm) or in accordance with local installation | |
codes and the requirements of the gas supplier. | ||||
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J. Clearance to nonmechanical air supply inlet to | 12 inches (30 cm) for models ≤100,000 BTUH (30 kW), | |||
| building or the combustion air inlet to any other | for models ≤50,000 BTUH (15 kW), 12 inches (30 cm) | ||
| appliance | 36 inches (91 cm) for models >100,000 BTUH (30 kW) | for models >50,000 BTUH (15 kW). | |
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K. Clearance to a mechanical supply inlet | 6 feet (1.83 m) | 3 feet (91 cm) above if within 10 feet (3 cm) | ||
horizontally | ||||
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L. | Clearance above paved sidewalk or paved | 7 feet (2.13 m)† | 7 feet (2.13 m) or in accordance with local installation | |
| driveway located on public property | codes and the requirements of the gas supplier. | ||
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M. Clearance under veranda, porch, deck, or balcony | 12 inches (30 cm)‡ | 12 inches (30 cm) or in accordance with local installa- | ||
tion codes and the requirements of the gas supplier. | ||||
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1.In accordance with the current CSA
2.In accordance with the current ANSI Z223.1 / NFPA 54, National Gas Code.
3.In accordance with the current ANSI Z21.47 * CSA 2.3 American National Standard.
†A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. †† 12 inches (30 cm) up from the bottom edge of the structure for
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor and the distance between the top of the vent termina- tion and the underside of the veranda, porch, or deck is greater than 1 foot (30 cm) as specified in CSA
A vent shall not terminate less than 1 foot (30 cm) above a grade level.
Any fresh air or make up inlet for dryer or furnace area is considered to be forced air inlet.
Avoid areas where condensate drippage may cause problems such as above planters, patios, or adjacent to windows where steam may cause fogging.
A terminus of a vent shall be fitted with a cap in accordance with the vent manufacturer’s installation instructions, or in accordance with the installation instructions for a special venting system.
IMPORTANT: Consideration must be given for degradation of building materials by flue gases. Sidewall termination may require sealing or shielding of building surfaces with a corrosion resistant material to protect against combustion product corrosion. Consideration must be given to wind direction in order to prevent flue products and/or condensate from being blown against the building surfaces. If a metal shield is used it must be a stainless steel material at a minimum dimension of 20 inches. It is rec- ommended that a retaining type collar be used that is attached to the building surface to prevent movement of the vent pipe.
Responsibility for the provision of proper adequate venting and air supply for application shall rest with the installer.
Vent shall extend high enough above building, or a neighboring obstruction, so that wind from any direction will not create a positive pressure in the vicinity of the vent.
Unitary Products Group | 17 |