Navien NPE-180A2 Installation Manual page 48

Ref Description
Vertical clearance to ventilated
soffit located above the terminal
within a horizontal distance of
D
2 ft (61 cm) from the center line
of the terminal.
Clearance to unventilated soffit
E
Clearance to outside corner
F
Clearance to inside corner
G
Clearance to each side of center
line extended above meter/
H
regulator assembly
Clearance to service regulator
I
vent outlet
Clearance to nonmechanical air
supply inlet to building or the
J
combustion air inlet to any other
appliance
Clearance to a mechanical air
K
supply inlet
Clearance above paved sidewalk
or paved driveway located on
L
public property
Clearance under veranda, porch
M
deck, or balcony
* Suggested clearances by the manufacturer. If the clearances required by local codes are different from those from the table above,
the greater clearance should apply.
1 The minimum distance from adjacent public walkways, adjacent buildings, openable windows, and building openings shall not be
less than those values specified in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane Installation
Code, CSA B149.1;
2 Information on preventing blockage by snow; and
3 Information on protecting building materials from degradation by flue gases.
† 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.
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
Note
●
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
●
If locally adopted installation codes specify clearances different than those illustrated, then the
●
most stringent clearance shall prevail.
48 Installing the Water Heater
Canadian installations
1
3 ft (91 cm)*
3 ft (91 cm)*
2 ft (61 cm)*
12 in. (30 cm)*
3 ft (91 cm) within a height of
15 ft (4.6 m)
3 ft (91 cm)
36 in. (91 cm) for appliances
>100,000 Btuh (30 kW)
6 ft (1.83 m)
7 ft (2.13 m)
†
12 in. (30 cm)
‡
US installations
2
3 ft (91 cm)*
3 ft (91 cm)*
2 ft (61 cm)*
12 in. (30 cm)*
3 ft (91 cm) within a height of
15 ft (4.6 m)*
3 ft (91 cm)*
12 in. (30 cm) for appliances >
50,000 Btuh (15 kW)
3 ft (91 cm) above if within 10 ft
(3 m) horizontally
7 ft (2.13 m) for mechanical draft
systems (Category I appliances).
Vents for Category II and IV
appliances cannot be located
above public walkways or other
areas where condensate or vapor
can cause a nuisance or hazard*
12 in. (30 cm) - open on 3 sides*