Bock Water heaters OT300-A Installation And Operation Instruction Manual page 20

SECTION IV: INSTALLATION (cont.)
VENT & COMBUSTION AIR INTAKE (cont.)
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.
Page 20
3 feet (91 cm) within a height 15 feet
above the meter/regulator assembly
Never install air intake terminal above vent (exhaust) terminal.
1
Canadian Installations
12 inches (30 cm)
36 inches (91 cm)
*
*
*
*
*
3 feet (91 cm)
36 inches (91 cm)
6 feet (1.83 m)
7 feet (2.13 m)†
†
12 inches (30 cm)
!
CAUTION
2
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
*
*