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WARNING
Boiler is to be vented by natural draft and shall not
be connected into any portion of mechanical draft
operating system under positive pressure.
• Inspect chimney to make certain it is constructed
according to the latest revision of the NFPA 211. Local
regulations may differ from this code and should be
checked. Where there is a conflict, the local code will
prevail.
• Install boiler into chimney having a masonry or metallic
chimney liner.
• Unlined chimney will have leaks that will cause poor
chimney performance (no draft), and could result in
positive pressure in the combustion chamber.
• Horizontal portions of venting system should not
exceed 10 feet in length. Horizontal lengths over 10 ft.
will have a negative effect on chimney performance.
• Extend chimney at least 2 ft. above any portion of
building within 10 ft. Producing a -.02 inch W.C. draft
in the combustion chamber. See Figure #11.
• See Ratings Table page 3 for recommended minimum
chimney or vent sizes.
• Inadequate draft causes improper combustion,
resulting in dirty flue ways and high fuel bills.
• Connect flue pipe same size as boiler outlet to chimney,
sloping upward continuously toward the chimney
approximately ¼" per foot. Bolt or screw joints
together to avoid sag.
VENTING SYSTEM INSPECTION & INSTALLATION
If oil fired water heater is vented into same flue as boiler,
provide separate hole into chimney whenever possible.
When this isn't possible, use "Y" connection in flue pipe,
using separate draft regulator for each unit.
When chimney does not provide adequate draft to handle
input from water heater and boiler simultaneously, wire
units so only one will operate at a time, favoring water
heater.
Figure #11
RIDGE
2' (.61 M) MIN.
12
MORE THAN 10' (3.1 M)
10' (3.1 M)
HEIGHT ABOVE ANY
ROOF SURFACE WITHIN
10' (3.1 M)
HORIZONTALLY
CHIMNEY 3' (.92 M)
GAS VENT OR
TYPE L VENT
2' (.61 M) MIN.
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