1-13
INSTALLATION
HC SERIES BOILERS
HC 13-50, HC 23-84, HC 29-106, HC 20-125, HC 33-160
E= Clearance to
unventilated soffit
*
*
F= Clearance to outside
corner
*
*
G= Clearance to inside
corner
*
*
H= Clearance to each side
of center line extended
above meter/regulator
assembly
3 ft (91 cm) within a height
15 ft above the meter/
regulator assembly
*
I= Clearance to service
regulator vent outlet
3 ft (91 cm)
*
J= Clearance to
nonmechanical air supply
inlet to building or the
combustion air inlet to any
other appliance
6 in (15 cm) for appliances
≤ 10,000 Btuh (3 kW), 12
in (30 cm) for appliances >
10,000 Btuh (3 kW) and ≤
100,000 Btuh (30 kW), 36
in (91 cm) for appliances
≤100,000 Btuh (30 kW)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3 kW), 9 in
(23 cm) for appliances >
10,000 Btuh (3 kW) and ≤
50,000 Btuh (15 kW), 12
in (30 cm) for appliances >
50,000 Btuh (15 kW)
K= Clearance to a
mechanical air supply inlet
6 feet (1.83 m)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
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 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.
WARNING
In addition to preventing
ingestion of chemical
contaminants, care must
be taken to ensure air
intake terminals are not
installed in locations where
contamination might occur
due to ingestion of particulate
foreign material (dust, dirt
and debris).
WARNING
Intake air openings must be
configured such that rain
or other forms of moisture
cannot enter the air intake
piping system. Otherwise
serious damage to the boiler
may result.
NOTE
Care must be taken when
installing air intake piping to
ensure that a “trap” is not
formed in the piping so as to
allow a build-up of water, and
blockage of intake air.
Such blockage will result in a
boiler safety shut-down.
V
V
V
V
V
V
V
V
V
X
X
F
C
B
D
E
B
K
M
G
A
INSIDE
CORNER DETAIL
H
FIXED
CLOSED
OPERABLE
OPERABLE
CLOSED
FIXED
B
J
A
B
B
B
V VENT TERMINAL
X AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
I
L
Figure 14: Vent Terminal Clearance
