Navien NFC-250/175H Installation Manual page 69

Ref Description
Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance
D
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
H
above meter/regulator assembly
I Clearance to service regulator vent outlet
Clearance to nonmechanical air supply inlet
J to building or the combustion air inlet to any
other appliance
K Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved
L
driveway located on public property
Clearance under veranda, porch deck, or
M
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
1
*
*
*
*
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)
‡
US Direct Vent
Installations
2
*
*
*
*
*
*
12 in (30 cm)
3 ft (91 cm) above
if within 10 ft (3 m)
horizontally
*
*
Venting for Combustion Air 69