A.O. Smith THR-160 Installation Instructions And Use & Care Manual page 27

D
E
L
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
Vertical clearance to ventilated soffit located above
D the vent terminator within a horizontal distance of 2
feet (61cm) from the center line of the termination
E Clearance to unventilated soffit
F Clearance to outside corner
G Clearance to inside corner
Clearance to each side of center line extended above
H
meter/regulator assembly
I Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to
J a building or the combustion air inlet to any other
appliance.
K Clearance to mechanical air supply inlet
Clearance above paved sidewalk or paved driveway
L
located on public property
M Clearance under veranda, porch deck, or balcony
*Clearance in accordance with local installation codes and the requirements of the gas supplier.
**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.
The vent for condensing water heaters shall not terminate:
• over public walkways; or
• near soffi t vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or cause property dam-
age; or
• where condensate vapor could cause damage or could be detrimental to the opera on of regulators, relief valves, or other equipment.
Notes:
1) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
2) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
Vent Termina on Clearances
B
C
Fixed
V
closed
Operable
V
F
B
Above a regulator within 3 ft (91 cm)
line of the regulator vent outlet to a
maximum vertical distance of 15 ft (4.5
Inside corner
V = Vent terminal
detail
X = Air supply inlet
G
= Area where the terminal
V
A
B
B
V
Fixed
Operable
V closed
X
B
V
B
J
A
1
Canada Installa ons
Direct vent and other than direct vent
1 ft (30 cm)
3 ft (91 cm)
0
3 ft (91 cm)
3 ft (91 cm)
2 ft (61 cm)
2 ft (61 cm)
3 ft (91 cm)
horizontally of the vertical center
m)
3 ft (91 cm)
6 ft (183 cm)
7 ft (213 cm)**
1 ft (30 cm)***
Residen al Gas Tankless Water Heater Use and Care Guide • 27
INSTALLATION
H
M
X
V
I
K
Regulator/Gas meter
vent outlet
US Installa ons
Direct vent Other than direct vent
1 ft (30 cm)
4 ft (1.2 m) below or to side
1 ft
of opening; 1 ft (30 cm)
(30 cm)
0
3 ft (91 cm)
3 ft (91 cm)
2 ft (61 cm)
2 ft (61 cm)
*
*
4 ft (1.2 m) below or to side
1 ft
of opening; 1 ft (30 cm)
(30 cm)
3 ft (91 cm) above if within
10 ft (3 m) horizontally.
7 ft
(213 cm)
1 ft
(30 cm)***
2
above opening
0
3 ft (91 cm)
3 ft (91 cm)
2 ft (61 cm)
2 ft (61 cm)
*
*
above opening
7 ft (213 cm)
1 ft (30 cm)***