Termination Clearances Sidewall Power Vent
POWER VENT
(using room air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
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VENT TERMINAL X AIR SUPPLY INLET | AREA WHERE TERMINAL IS NOT PERMITTED |
FIGURE 15.
Vent terminal clearances for “Power Vent” installations. Power Vent configurations use room air for combustion.
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A | Clearance above grade, veranda, porch, | 12 inches (30 cm) | H | Clearance to each side of center line | 3 feet (91 cm) within a height 15 feet (4.5 m) | |
deck or balcony | extended above meter/regulator assembly | above the meter/regulator assembly* | ||||
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B | Clearance to window or door that may | 4 feet (1.2 m) below or to side of opening; 1 | I | Clearance to service regulator vent outlet | 3 feet (91 cm)* | |
be opened | foot (30 cm) above opening |
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| Clearance to a non mechanical air supply | 4 feet (1.2 m) below or to side of opening; | |
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Clearance to permanently closed window | 12 inches (30 cm)* | inlet into building or combustion air inlet to | ||||
(30 cm) above opening. | ||||||
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| Vertical clearance to ventilated soffit |
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D | located above the terminal within a | 12 inches (30 cm)* | K |
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Clearance to a mechanical air supply inlet | 10 feet (3 m) horizontally | |||||
horizontal distance of 2 feet (61 cm) from | ||||||
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E | Clearance to unventilated soffit | 12 inches (30 cm)* | L | Clearance above paved sidewalk or paved | 7 feet (2.13 m) † | |
driveway located on public property |
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F | Clearance to outside corner | 2 feet (60 cm)* | M | balconyClearance under veranda, porch, deck, or | 12 inches (30 cm) ‡ | |
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G | Clearance to inside corner | 18 inches (45 cm)* |
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In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
†A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
VENT PIPE TERMINATION
The first step is to determine where the vent pipe will terminate. See Figures 15, 20 and 21. The vent may terminate through a sidewall as shown in Figure 20 or through the roof as shown in Figure 21.
The vent system must terminate so that proper clearances are maintained as cited in local codes or the current edition of the National Fuel Gas Code, (ANSI Z223.1, 12.9.1 through 12.9.4).
Instructions on proper installation through a sidewall are provided in Figure 15.
Plan the vent system layout so that proper clearances are maintained from plumbing and wiring.
Vent pipes serving power vented appliances are classified by building codes as “vent connectors”. Required clearances from combustible materials must be provided in accordance with information in this manual under LOCATING THE NEW WATER HEATER and INSTALLING THE WATER HEATER, and with the National Fuel Gas Code and local codes.
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