Navien NCB-150E Installation & Operation Manual page 41

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 within a horizontal distance of 2 ft (61 cm) from
D
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
H
meter/regulator assembly
I Clearance to service regulator vent outlet
Clearance to nonmechanical air supply inlet to building
J
or the combustion air inlet to any other appliance
K Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved driveway
L
located on public property
M Clearance under veranda, porch deck, or balcony
1 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2 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.
Canadian Direct Vent Installations
12 in (30 cm)
36 in (91 cm)
*
*
*
*
*
3 ft (91 cm) within a height
15 ft above the meter/regulator
assembly
3 ft (91 cm)
36 in (91 cm)
6 ft (1.83 m)
7 ft (2.13 m) †
12 in (30 cm) ‡
1 US Direct Vent Installations
12 in (30 cm)
12 in (30 cm)
*
*
*
*
*
*
*
12 in (30 cm)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
*
Venting the Boiler
2
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