Beckett AFG - Manual (Page 6)

6
Carefully inspect the chimney or exhaust vent
system.
Make sure it is properly sized and in good working
condition.
Follow the instructions supplied by the appliance
manufacturer.
The installation must strictly comply with all
applicable codes, authorities having jurisdiction and
the latest revision of the National Fire Protection
Association Standard NFPA 31 for the installation of
chimneys and vent sizing, (or CSA-B139 and CSA-
B140 in Canada).
Regulation by these authorities take precedence
over the general instructions provided in this
installation manual. y
y
y
y
y
Fire, Smoke & Asphyxiation
Hazard
piece of broken tile wedged in the chimney should
be removed.
No other appliance connection should be made to
the same fl ue pipe.
The fl ue pipe should have an upward pitch toward
the chimney of at least 1/4” per foot of length. It
should fi t tightly and should not project into the
chimney.
Any leakage between tiles, around clean-out doors,
or around the vent pipe should be sealed.
Insulated stainless steel chimney liners
The new designs of high effi ciency oil furnaces and
boilers in conjunction with fl ame retention oil burners
are more effi cient. One result of increased effi ciency is
lower fl ue gas temperatures. As fl ue gases rise in the
chimney, they will cool and condense when they reach
the dew point. The condensation will mix with the sulphur
in the fl ue gases creating sulphuric acid. The acid will
attack the chimney mortar, brick and clay liners causing
corrosion, deterioration and blockage of the chimney.
Eventually the blockage could prevent exhausting the
fl ue gases. Instead, the fl ue gases could vent out the
barometric damper into the living space.
Therefore, it is strongly recommended that an approved
insulated stainless steel liner be installed.
For those installations not requiring a chimney, such
as through-the-wall vented appliances, follow the
instructions given by the appliance and power venter
(if used) manufacturers.
5.
6.
7.
○
Inspect Chimney or Direct Vent System
Starting with minimum gph fi ring rate, the minimum
size recommended is 6” fl ue pipe with 8” X 8”
inside chimney, unless specifi ed otherwise by the
appliance manufacturer.
A chimney fl ue shall extend at least 3 feet above
the highest point at which the chimney comes in
contact with the roof, and not less than 2 feet above
the highest roof surface or structure within 10 feet
horizontally of the chimney. Refer to Figure 2.
Any accumulation of soot or debris in chimney
offsets should be removed
Any obstructions such as a protruding joint or a 1.
2.
3.
4.
Section: Inspect/Prepare Installation Site
Figure 2 – Chimney Design - Above the Roof
NOTE: Correct chimney design is shown by dotted lines. Incorrect chimney design, as shown by the solid lines, may
result in down-drafts.
Inspect/Prepare Installation Site