Navien NPN Installation & Operation Manual page 37

*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.
For outdoor models (other than direct vent)
Ref Description
A Clearance above grade, veranda, porch, deck, or balcony
B Clearance to window or door that may be opened
C Clearance to permanently closed window
Vertical clearance to ventilated soffit located above the terminal
D within a horizontal distance of 2 ft (61 cm) from the center line
of the terminal
E Clearance to unventilated soffit
F Clearance to outside corner
G Clearance to inside corner
Clearance to each side of center line extended above meter/
H
regulator assembly
I Clearance to service regulator vent outlet
Clearance to nonmechanical air supply inlet to building or the
J
combustion air inlet to any other appliance
K Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved driveway located on
L
public property
M Clearance under veranda, porch 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.
36 Installing the Water Heater
Non-Direct Vent Installation Clearance
12 in (30 cm)
4 ft (1.2 m) below or to side of opening;
1 ft (300 mm) above opening
As specified by the manufacturer*
As specified by the manufacturer*
As specified by the manufacturer*
As specified by the manufacturer*
As specified by the manufacturer*
As specified by the manufacturer*
As specified by the manufacturer*
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*
1