Playing With Fire
Fireplaces are great, but don't burn down the house
By Walter Jowers
NOVEMBER 15, 1999:
Most of us like fire the way Bubba in Forrest Gump liked shrimp.
We like campfires and bonfires and even fires in the house. We like wood
fires, gas fires, fires in the living room, den, and bedroom.
I enjoy a nice fire myself. Some years back, before we got our chimney
fixed up, we had a set of electric logs in our fireplace. The electric logs
were just a cheap sculpture of logs with a little plastic Ferris-wheel
device tattooed to look like fire. The wheel spun around a light bulb and
made a repetitive crackling sound. I'd turn the thing on and just laugh and
laugh.
Eventually, we got a set of gas logs, which are a big improvement over
the electric logs. The quality of the log sculpture is better, and there's
an actual flame. The flame is fed by natural gas, so there's no smoke, no
crackling, and no wood smell. The flame pattern repeats every few seconds,
like one of those scrolling ads on a gas pump. It's great fun.
Clearly, humans' love of fire comes from some primitive little cluster
of brain cells that can't process higher, logical thought. I say this
because it's pretty dang obvious to me: If you put five seconds of logical
thought to our love of fire and fireplaces, you realize it's just nuts.
Quick, answer this question: Are you in favor of fire in the house, yes
or no? The smart answer would be "no." In this day of central heating,
built-in cooktops, and microwave/convection ovens, there's no good reason
to have a fire in the house.
The big problem with fire in the house is that it can burn your house
down. I remember an incident about three years ago, when a guy set a
smoldering log out on his apartment balcony. The log flared up and set the
apartment complex on fire. The next winter, a local pizza joint had a
chimney fire. The pizza joint burned.
There's nothing you can do about a person who sets a hot log on a wood
balcony. A certain number of people are just bound to start fires, run over
their feet with lawn mowers, or electrocute themselves by peeing onto
high-voltage wires. But you can reduce the risk of a chimney fire just by
getting the chimney cleaned.
Every time you have a real wood fire, some creosote sticks to the inside
of the chimney (also called the flue). In general, the wetter or the
sappier the wood, the cooler the fire, and the worse the creosote buildup.
Creosote, like the logs that made it, is flammable. If the creosote gets
hot enough, it'll burn like a blowtorch, causing the chimney to vibrate and
fall apart. That means sparks in the attic. After attic sparks, the next
thing you get is a fire truck, followed by a TV crew who'll try to get you
to cry on camera.
A simple chimney cleaning--which generally costs between $75 and
$150--can prevent this kind of ugly scene. In our relatively short
fireplace season, you can probably get away with just one chimney cleaning
a year. Serious wood-burning people in colder parts of the country might
need two cleanings a year. You need a qualified chimney sweep to do the
job.
If you have a masonry flue with a clay tile flue liner, hire a high-tech
chimney sweep to drop a video camera down the flue. That's the only good
way to find cracks, which are very common in clay tile flues. Cracked tiles
can give you that ugly sparks-in-the-attic problem.
These days, the safest fireplaces are probably the prefab metal ones.
They come from the factory with all the right parts and directions that
explain how to install them so they won't set your house on fire. It's not
impossible to screw up the installation of one of these prefab units, but
it's hard. That's why they're so popular in new houses these days.
If you're looking to add a fireplace to an existing house, I've got to
warn you: Go to just about any fireplace shop these days, and chances are
the salesfolk will steer you toward a set of ventless gas logs. These
things are very popular, because they hold out the promise of a fire-like
experience without the hassle and expense of adding a chimney.
I don't have time to read angry letters from ventless-fireplace
advocates, so let me say right here: To the best of my knowledge, ventless
fireplaces aren't killing people or making people sick in any great
numbers. If you want a ventless fireplace, go buy one, or several.
Recommend 'em to your friends.
But I'll tell you this: I would not have, in my own house, a fake-a-zoid
fireplace that spews carbon dioxide, nitrogen dioxide, and maybe even
carbon monoxide. The gas logs at my house are vented up a real enough
chimney. I wouldn't have it any other way.
Read the owner's manuals on ventless gas logs, and you'll find that
they're not recommended for sleeping rooms, they should be operated only
for short periods of time, and they shouldn't be used for heating purposes.
If the burners on ventless gas logs get a coating of dust or pet hair,
the combustion efficiency suffers. Lower efficiency means more carbon
monoxide, and carbon monoxide can give you headaches, make you tired, or
maybe even kill you.

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