Bock Water heaters OT300 Installation And Operation Instruction Manual page 21

SECTION IV: INSTALLATION
Table 9: Power Vent Terminal Clearances
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
D = Vertical clearance to ventilated
soffit located above the terminal within
a horizontal distance of 2 feet (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
I = Clearance to service regulator vent
outlet
J = Clearance to non-mechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
K = Clearance to a mechanical air
supply inlet
L = Clearance above paved sidewalk or
paved driveway located on public
property
M = Clearance under veranda, porch,
deck, or balcony
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.
† 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.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
In addition to the clearances specified, the following items shall be accounted for during
installation:
• Do not terminate near soffit vents or crawl space or other area where condensate or
vapor could create a nuisance hazard or cause property damage.
• Do not locate the exhaust vent terminal where condensate or vapor could cause damage
or could be detrimental to the operation of regulators, relief valves, or other equipment.
• Do not locate the exhaust vent terminal over public area or walkways where condensate
or vapor can cause nuisance or hazard.
• Do not locate the vent terminal in proximity to plants/shrubs.
• The vent and air intake shall terminate a minimum of 12" (25.4 cm) above expected
snowfall level to prevent blockage.
Never install air intake terminal above vent (exhaust) terminal.
Canadian Installations
12 inches (30 cm)
36 inches (91 cm)
*
*
*
*
*
3 feet (91 cm) within a height 15 feet
above the meter/regulator assembly
3 feet (91 cm)
36 inches (91 cm)
6 feet (1.83 m)
7 feet (2.13 m)†
12 inches (30 cm)
!
CAUTION
1
US Installations
12 inches (30 cm)
4 feet (1.2 m) below or to side
of opening; 1 foot (300 mm)
above opening
4 feet (1.2 m) below or to side
of opening; 1 foot (300 mm)
above opening
3 feet (91 cm) above if within
10 feet (3 m) horizontally
†
2
*
*
*
*
*
*
*
*
*
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