Noritz GQ-C2857WS-FF US 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 the Natural Gas and Propane Installation Code
CSA B149.1.
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 horizontal distance
D=
of 2 feet (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
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
Description
Canadian Direct Vent Installations
(30 cm) for appliances > 10,000
appliances > 100,000 Btuh (30 kW)
horizontally of the vertical center line of
the regulator vent outlet to a maximum
I
12 in (30 cm)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
*
*
*
*
*
*
Above a regulator within 3 ft (91 cm)
vertical distance of 15 ft (4.5 m)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
(30 cm) for appliances > 10,000
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
appliances > 100,000 Btuh (30 kW)
6 ft (1.83 m)
7 ft (2.13 m)†
12 in (30 cm)‡
Vent Terminal
Air Supply Inlet
Area Where Terminal
is Not Permitted
US Direct Vent Installations
1
12 in (30 cm)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 9 in
(23 cm) for appliances > 10,000
Btuh (3kW) and ≤ 50,000 Btuh
(15 kW), 12 in (30 cm) for
appliances > 50,000 Btuh (15 kW)
*
*
*
*
*
*
*
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 9 in
(23 cm) for appliances > 10,000
Btuh (3kW) and ≤ 50,000 Btuh
(15 kW), 12 in (30 cm) for
appliances > 50,000 Btuh (15 kW)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
*
2