1-13
INSTALLATION
DC SERIES BOILERS / WATER HEATERS
DC 15-95, DC 15-96, DC 20-125, DC 33-160
CANADIAN
INSTALLATIONS
1
US
INSTALLATIONS
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 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)
C= Clearance to window or
door that may be opened
*
*
D= Clearance to
permanently closed window
*
*
E= Clearance to
unventilated soffit
*
*
F= Clearance to outside
corner
* 4 ft (1.22m) or local code,
whichever is stricter
* 4 ft (1.22m) or local
code, whichever is
stricter
G= Clearance to inside
corner
* 4 ft (1.22m) or local code,
whichever is stricter
* 4 ft (1.22m) or local
code, whichever is
stricter
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 /
water heater 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 / water heater safety
shut-down.
