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INSTALLATION INSTRUCTIONS
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) 12 in. (30 cm)
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 soffit
located above the terminal within a
horizontal distance of 2 ft. (61 cm)
from the centerline of the terminal.
E = Clearance to unventilated soffit.
F = Clearance to outside corner.
G = Clearance to inside corner.
H = Clearance to each side of centerline
extended 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.
12 in. (30 cm)
‡
1 In accordance with current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2 In accordance with current CAN/CSA B149.1 Installation Codes.
For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/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.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
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.
Venting
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