Navien NFB-175H Installation Manual page 60

Ref Description
Vertical clearance to ventilated soffit located above
D the terminal 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
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.
60 Venting for Combustion Air
Canadian Direct US Direct Vent
Vent Installations Installations
1
* *
* *
* *
* *
3 ft (91 cm) within a
height 15 ft above
*
the meter/regulator
assembly
3 ft (91 cm) *
36 in (91 cm) 12 in (30 cm)
3 ft (91 cm) above
6 ft (1.83 m) if within 10 ft (3 m)
horizontally
7 ft (2.13 m) *
†
12 in (30 cm) *
‡
2