36 Installing the Water Heater
*The manufacturer shall specify a minimum clearance or state “Not applicable” in the table and/or instructions.
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
As specified by the manufacturer*
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
As specified by the manufacturer*
E
Clearance to unventilated soffit
As specified by the manufacturer*
F
Clearance to outside corner
As specified by the manufacturer*
G
Clearance to inside corner
As specified by the manufacturer*
H
Clearance to each side of center line extended above meter/
regulator assembly
As specified by the manufacturer*
I
Clearance to service regulator vent outlet
As specified by the manufacturer*
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
As specified by the manufacturer*
* The manufacturer shall specify a minimum clearance or state “Not applicable” in the table and/or instructions.
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.
