Consumer
Product Safety Commission
Chimneys: Safety Alert
CPSC research indicates that most wood heating fires
involve the chimney and not the appliance itself. The majority of
these fires are contained within the chimney and cause no damage to
the house. The Commission is concerned, however, not only about the
chimney fires that did ignite other parts of the house, but also about
the potential future hazard from the continued use of chimneys whose
structural integrity has been compromised by a chimney fire. This
is especially true in light of the fact that many contained chimney
fires are not reported to the fire services; in fact, consumers may
not even be aware that a chimney fire has occurred.
Therefore, the Consumer Product Safety Commission is
issuing a special safety alert concerning chimneys used with woodburning
stoves, fireplaces, and fireplace inserts. The Commission urgently
warns consumers to be aware of the potential fire hazards associated
with these chimneys.
Now that the nation has entered the heating season,
the Commission strongly urges you, if you have a stove or fireplace,
to check the chimney for any damage that may have occurred in the
past heating season. If it is difficult to examine the chimney, a
local chimney repairman, chimney "sweep," or dealer can
help. Have any damage repaired NOW.
Most fires involving either masonry or prefabricated
metal chimneys occur because of improper installation, use or maintenance.
The Commission staff has identified the following common causes of
fires:
- Improper chimney installation too close to wood framing.
- Installation of thermal insulation too close to the chimney.
- Improperly passing the stovepipe or chimney through a ceiling
or wall, causing ignition of wood framing.
- Structural damage to the chimney caused by the ignition of creosote
(a black tar-like substance that builds up inside the chimney
in normal use).
Even when the heating appliance is properly installed,
people with either metal or masonry chimney systems should frequently
check the chimney for creosote deposits, soot build-up, or physical
damage. This involves only a simple visual examination, but it should
be done as often as twice a month during heavy use. If you see heavy
creosote buildup, suspect a problem, or have had a chimney fire, a
qualified chimney repairman or chimney "sweep" should perform
a complete safety inspection. They can arrange for any necessary repairs
or creosote removal, which must be done before the heating appliance
is used again.
If you have had a fire or other safety problem with
your chimney, or would like additional information, call the Commission's
toll-free Hotline 800-638-CPSC.