Chimney Liners - Beckett CG15 Manual

Chimney Liners

Explosion, Fire, and Asphyxiation Hazard
The new designs of furnaces and boilers are more
efficient. One result of increased efficiency is lower
flue gas temperatures. As flue gases rise in the
chimney, they cool and condense when they reach
the dew point. The condensation mixes with sulphur
in the flue gases creating sulfuric acid. The acid
attacks the chimney mortar, brick and clay liners
causing corrosion, deterioration, leaks, or blockage of
the chimney. Eventually the blockage could prevent
exhausting the flue gases. Instead, the flue gases
vent out the barometric damper into the living space.
Approved insulated stainless steel chimney liner
should be installed, the installing contractor is solely
responsible for installation of the proper vent system.
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.
Figure 4 — 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.
CG15, CG25, CG50 Burner Manual, Form No. 6104BCG50
Minimum Clearence: 2 FT.
Section: Inspect & Prepare Installation Site — 9