Navien NPE-180A2 Installation Manual page 51

Ref Description
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
* The manufacturer shall specify a minimum clearance or state "Not applicable" in the table and/or instructions.
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.
50 Installing the Water Heater
Canadian installations
1
6 in (15 cm) for appliances ≤
●
10,000 Btuh (3 kW),
12 in (30 cm) for appliances
●
> 10,000 Btuh (3 kW) and ≤
100,000 Btuh (30 kW),
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
4 ft (1.2 m) below or to side of
opening; 1 ft (300 mm) above
opening
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
As specified by the
manufacturer*