Noritz ecoTOUGH NRC98-DV-NG Installation Manual page 8

Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the outdoors (Direct Vent)>
* All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.
D
E
L
Ref
Clearance above grade, veranda, porch,
A=
deck, or balcony
Clearance to window or door that may
B=
be opened
C= Clearance to permanently closed window
Vertical clearance to ventilated soffit
located above the terminal within a
D=
horizontal distance of 2 feet (61 cm)
from the center line of the terminal
E= Clearance to unventilated soffit
Clearance to outside corner
F=
G=
Clearance to inside corner
Clearance to each side of center line
H=
extended above meter/regulator assembly
I= Clearance to service regulator vent outlet
Clearance to nonmechanical air supply
J= inlet to building or the combustion air inlet
to any other appliance
Clearance to a mechanical air supply inlet
K=
Clearance above paved sidewalk or paved
L=
driveway located on public property
Clearance under veranda, porch, deck,
M=
or balcony
In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
1
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
2
† 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.
Clearance to opposite wall is 24 inches (60 cm).
8
B
C
F
B
Description
G
A
H
B
B
B
J
A
B
Vent Terminal
Air Supply Inlet
Canadian Direct Vent
Installations
1
12 in (30 cm)
36 in (91 cm)
*
*
*
*
*
3 ft (91 cm) within a height
15 ft (4.5 m) 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)‡
I
M
K
Area Where Terminal
is Not Permitted
US Direct Vent
Installations
2
12 in (30 cm)
12 in (30 cm)
*
*
*
*
*
*
*
12 in (30 cm)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
*