2
P/N 473921000
Vent Terminal Installation Requirements
Through the wall termination installation shall conform to
requirements of authority having jurisdiction or in absence
of such requirements
• Canada
Current Edition of Canadian Standards
Association CSA B139,
• United States
ANSI/NFPA 31.
Canadian Installation
Refer to figure 2, vent terminal shall not terminate :
A. Directly above paved sidewalk or paved driveway that
is located between two buildings, and serves both.
B. Less than 7 feet (2.13m) above any paved sidewalk or
paved driveway.
C. Within 6 feet (1.80m) of a window, door, or
mechanical air supply inlet to any building, including
soffit openings.
D. Above gas/regulator assembly within 3 feet (1m)
horizontally of center-line of regulator.
E. Within 6 feet (1.80m) of any gas service regulator
vent outlet or within 3 feet (1m) of any oil tank vent
or any oil tank fill inlet.
Introduction
• Direct Vent refers to sealed combustion system.
• Draft regulator (furnished with standard chimney vent
boiler) is not used for direct venting.
• Direct Vent series is ideal for applications where a
conventional chimney is unavailable, not easily installed;
electrically heated home being retrofit for oil forced air
heating for example.
• Direct vented appliances require planning, the range
of flue lengths is restricted, clearances are critical, and
national and local codes are strict with respect to safety.
• Be sure the Boiler can be installed within homes
physical limitations, and accordance with local codes
and regulations. Physical limitations include sufficient
clearance to grade. Avoid vent termination locations
subject to frequent strong wind gusts.
• See Table 1
for approved venting.
Oil Burners
Riello’s 40BF series Oil burners, are certified for venting
through the wall using ducted outdoor air for combustion.
Standard Riello 40F Series are not certified for use, in
direct vent applications.
The oil burner contains a probe to measure overfire
pressure and a pressure switch which does not permit
burner to operate if intake or exhaust are blocked.
Figure 1 - Standard Vent Terminal Assembly
DIRECT VENTING OF OIL FIRED BOILERS
F. Less than 1 foot (0.3m) above grade level within
6 feet (1.80m) of any combustion air inlet, unless
appliance is otherwise certified.
G. Within 6 feet (1.80m) of property line.
H. Underneath veranda, porch, or deck.
I. So the flue gases are directed at combustible material
or at any openings of surrounding buildings that are
within 6 feet (1.80m).
J. Less than 3 feet (1m) from inside corner of L-shaped
structure.
K. So the bottom of the vent termination opening is
less than 1 foot (0.3m) above any surface that may
support snow, ice, or debris.
L. So the flue gases are directed towards bricks, siding,
or other construction, in such a manner that may
cause damage from heat or condensate from flue gas.
M. Within 4 feet (1.2m) of power venter.
USA Installation
Refer to figure 3, vent terminal shall not terminate:
A. Less than 7 feet (2.13m) above any adjacent public
walkway.
B. Less than 4 feet (1.22m) below, 4 feet horizontally, or
1 foot (0.3m) above door, window, or gravity air inlet
of the structure.
C. Less than 1 foot (0.3m) above grade.
D. Less than 1 foot (0.3m) from soffit or roof of
structure.
E. Less than 3 feet (0.9m) from inside corner of L shaped
structure.
F. Less than 5 feet (1.6m) of gas regulator vent outlet,
or oil tank vent outlet.
G. Underneath veranda, porch or deck.
