A vent-free or room-vented appliance is safe, efficient and cheap as
long as it is installed, operated and maintained in accordance with the
installation instructions provided with the appliance.
Now we'll cover the stuff to be concerned about.
The instruction manuals for vent-free appliances are very specific and
they all have some consistent information. Part of the information given
is that not following the manual exactly may result in property damage,
danger to person(s) in the home and/or death. Here are some of the
1. - In 'unusually' tight construction, you must provide make-up air from
outside. (Open a window.) Unusually tight construction is defined as a
house with door and window gaskets, caulked door and window
installations, and a vapor barrier, like TyVek House Wrap. If this
sounds like nearly every house built today, it's because it is.
2. - Too avoid sooting, you must have the appliance serviced and
cleaned 'at least annually, but more often if excessive lint, hair, dust
etc... exist in the home'.
3. - A vent-free appliance will product 1 ounce of water for every 1000
BTU's of gas input per hour. This means a 40,000 BTU log set will
produce 40 oz of water per hour. In 6 hours, it would be 240 oz. - nearly
What's all this mean?
Open a window when you use it. (Not really vent free)
If it messes up, it will turn your home black on the inside.
If you noticed signs of excessive moisture build-up, turn it off.
...and there is a smell associated with vent-free appliances - especially
those on LP. For some, it's unbearable and for others it's not a big
deal, but you should know what you're in for before you make a