39
Installing the Water Heater
* Suggested clearances by the manufacturer. If the clearances required by local codes are different from those from the table
above, the greater clearance should apply.
1) The minimum distance from adjacent public walkways, adjacent buildings, openable windows, and building openings shall
not be less than those values specified in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and
Propane Installation Code, CSA B149.1;
2) Information on preventing blockage by snow; and
3) Information on protecting building materials from degradation by flue gases.
† 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.
Note
●
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
●
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
●
If locally adopted installation codes specify clearances different than those illustrated, then the
most stringent clearance shall prevail.
For outdoor models (other than direct vent)
Ref Description
Non-Direct Vent Installation Clearance
1
A
Clearance above grade, veranda, porch, deck, or balcony
12 in (30 cm)
B
Clearance to window or door that may be opened
4 ft (1.2 m) below or to side of opening;
1 ft (300 mm) above opening
C
Clearance to permanently closed window
12 in (30 cm)*
D
Vertical clearance to ventilated soffit located above the terminal
within a horizontal distance of 2 ft (61 cm) from the center line
of the terminal
3 ft (91 cm)*
E
Clearance to unventilated soffit
3 ft (91 cm)*
F
Clearance to outside corner
2 ft (61 cm)*
G
Clearance to inside corner
12 in (30 cm)*
H
Clearance to each side of center line extended above meter/
regulator assembly
3 ft (91 cm) within a height of 15 ft (4.6 m)*
I
Clearance to service regulator vent outlet
3 ft (91 cm)*
J
Clearance to nonmechanical air supply inlet to building or the
combustion air inlet to any other appliance
4 ft (1.2 m) below or to side of opening;
1 ft (300 mm) above opening
K
Clearance to a mechanical air supply inlet
3 ft (91 cm) above if within 10 ft (3 m) horizontally
L
Clearance above paved sidewalk or paved driveway located on
public property
7 ft (2.13 m) for mechanical draft systems (Category
I appliances). Vents for Category II and IV appliances
cannot be located above public walkways or other
areas where condensate or vapor can cause a
nuisance or hazard
M
Clearance under veranda, porch deck, or balcony
12 in (30 cm) - open on 3 sides*
* Suggested minimum clearances by the manufacturer. If the clearances required by the local authority or gas supplier are
different from those from the table above, the greater clearance should apply.
1) The minimum distance from adjacent public walkways, adjacent buildings, openable windows, and building openings shall
not be less than those values specified in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and
Propane Installation Code, CSA B149.1;
2) Information on preventing blockage by snow; and
3) Information on protecting building materials from degradation by flue gases.
† 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.
Note
●
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
●
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
●
If locally adopted installation codes specify clearances different than those illustrated, then the
most stringent clearance shall prevail.
