Instructions / Assembly

38
INSTALLATION INSTRUCTIONS
Venting
Venting for Direct-Vent Water Heater (cont.)
Location
U.S. Installation
Requirements
1
Canadian Installation
Requirements
2
A = Clearance above grade, veranda, porch,
deck, or balcony.
12 in. (30 cm) above anticipated snow
level.
12 in. (30 cm) above anticipated snow
level.
B = Clearance to window or door that may be
opened.
• 6 in. (15 cm) for water heaters less
than or equal to 10,000 Btuh (3 kW).
• 9 in. (23 cm) for water heaters greater
than 10,000 Btuh (3 kW) and less
than or equal to 50,000 Btuh (15 kW).
• 12 in. (30 cm) for water heaters
greater than 50,000 Btuh (15 kW).
• 6 in. (15 cm) for water heaters less
than or equal to 10,000 Btuh (3 kW).
• 12 in. (30 cm) for water heaters
greater than 10,000 Btuh (3 kW) and
less than or equal to 100,000 Btuh
(30 kW).
• 36 in. (91 cm) for water heaters
greater than 100,000 Btuh (30 kW).
C = Clearance to permanently closed window.
D = Vertical clearance to ventilated soft lo-
cated above the terminal within a horizontal
distance of 2 ft. (61 cm) from the centerline
of the terminal.
E = Clearance to unventilated soft.
F = Clearance to outside corner.
G = Clearance to corner.
H = Clearance to each side of centerline ex-
tended above meter/regulator assembly.
3 ft. (91 cm) within a height of 15 ft.
(4,57 m) above the meter/regulator
assembly.
I = Clearance to service regulator vent outlet.
3 ft. (91 cm)
J = Clearance to nonmechanical air supply inlet
to the combustion air inlet to any building or
other appliance.
• 6 in. (15 cm) for water heaters less
than or equal to 10,000 Btuh (3 kW).
• 9 in. (23 cm) for water heaters greater
than 10,000 Btuh (3 kW) and less
than or equal to 50,000 Btuh (15 kW).
• 12 in. (30 cm) for water heaters
greater than 50,000 Btuh (15 kW).
• 6 in. (15 cm) for water heaters less
than or equal to 10,000 Btuh (3 kW).
• 12 in. (30 cm) for water heaters
greater than 10,000 Btuh (3 kW) and
less than or equal to 100,000 Btuh
(30 kW).
• 36 in. (91 cm) for water heaters
greater than 100,000 Btuh (30 kW).
K = Clearance to mechanical air supply inlet. 3 ft. (91 cm) above if within 10 ft. (3 m)
horizontally.
6 ft. (1,83 m)
L = Clearance above paved sidewalk or paved
driveway located on public property.
7 ft. (2,13 m)
†
M = Clearance under veranda, porch, deck, or
balcony.
Not Allowed Not Allowed
1 In accordance with current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2 In accordance with current CSA B149.1 Installation Codes.
For clearances not specied in ANSI 223.1/NFPA 54 or CSA B149.1, one of the following shall be indicated:
a) A minimum clearance value determined by testing in accordance with section 2.20, or
b) A reference to the following footnote: “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.
The following chart details the minimal dimensional information needed to determine the proper location of
the vent terminal for direct vent and outdoor tankless water heaters. See corresponding letter reference in
the illustration at left.