Direct Venting Of Oil Fired Boilers - Dunkirk Excelsior EXB Series Supplemental Instructions

Introduction
• Direct Vent refers to sealed combustion system.
• 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
Beckett NX and Riello's 40BF series Oil burners, are certi-
fied for venting through the wall using ducted outdoor air
for combustion.
Standard Beckett AFG Series and Riello 40F Series are not
certified for use, in direct vent applications.
The oil burner contains a probe to measure overfire pres-
sure and a pressure switch which does not permit burner to
operate if intake or exhaust are blocked.
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.

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 struc-
ture.
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.
Figure 1 - Standard Vent Terminal Assembly
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P/N 240009355, Rev. C [11/15/2015]