Table of Contents
Advertisement
6.4 Vent Pipe Installation (Direct Vent)
6.4.1 Clearance Requirements from Vent Terminations to Building Openings
[When supplying combustion air from the outdoors]
• 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.
[ D ]
Ven lated soffit
located
Less than 2
Ref
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
D Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance 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
H Clearance to each side of center line extended
above meter/regulator assembly
I
Clearance to service regulator vent outlet
J
Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
appliance
K
Clearance to a mechanical air supply inlet
L
Clearance above paved sidewalk or paved
driveway located on public property
M Clearance under veranda, porch, deck, 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 in. (60 cm).
26
Venting the Combi Boiler
Description
Canadian Direct Vent Installations
12 in. (30 cm)
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)
*
*
*
*
*
*
Above a regulator within 3 ft (91 cm)
horizontally of the vertical center
line of the regulator vent outlet to a
maximum 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 Permi ed
[ K
]
for US
Mechanical air
supply inlet
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
Advertisement
Table of Contents
