direct vent vs. vent free gas fireplace

I'm planning to install a gas fireplace. Fortunately the location has direct access to an unused flue on my chimney. What are the pros & cons of direct vented vs. vent free, I haven't been able to find much on the web beyond the fact that vent free will add moisture.
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My vent free also produces an odor - not so much as you notice when you're using it, but when you go outside and come back in it will be apparent. Not a gas smell, but a combustion smell. Also, after using for several hours, the digital CO2 detector will show an increase but never to the point of alarming. So IMHO, they're good for taking the chill off or for mood stimulation, but not for long term use.
Red
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wrote:

After reading the first two "Caution" and "Warning" pages of the installation instructions of a "vent free" appliance, most "sane" people wouldnt use one anywhere but in the great outdoors. :-) Bubba
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wrote:

You really have a CO2 detector? Not a CO detector?
Bob
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It will also heat better, but as noted it may have an odor. Don't assume that the available vent is suitable for the fireplace. Have it checked by someone who really knows first.

--
Joseph Meehan

Dia \'s Muire duit
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Which it will heat better. What do you mean specifically by don't assume the vent isn't suitable? It's a clay tile lined chimney inside concrete block veneered with brick.

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--
Joseph Meehan

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Also check your local codes. Unless they've changed things, they are not legal in NY. Could be the same for other states, too. I don't know.
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I've been using a vent free inside an unused fireplace for about 7 years. Its great. We live in a split foyer (walk in and go up or down) and our basement/family room is quite chilly in the winter. A vented unit does little more than look pretty since 90% of the heat goes up the chimney. Our flue is closed, the doors are open, and all of the heat goes into the room. Keeping it on a low trickle is enough to keep the room nice and toasty. I don't have any moisture or CO issues (we have a detector in the nearby hallway.)
The flame on vented units tend to look more realistic. Our looks more like a stove on high with fake logs around it (lots of blue). But again, I'm more interested in the heat than the looks.
--Jeff
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On Sun, 25 Nov 2007 07:41:38 -0600, "Jeff Dieterle"

Can't list the pros and cons. My thoughts are that anything that is burning needs to be vented. Check out your chimney to make sure it is in good condition. My gas fireplace is side-vented to the outside--unfortunately, I have no chimney. Currently, I have the fireplace stuffed with insulation (I havn't turned it on in over 8 years) because it creates a cold draft.
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Correct, but the question is how much venting. Many of the new propane heaters are 99+% efficient so there is not much fume, however, they do consume oxygen. Since the airtightness of houses varies considerably, that is not a big deal in most cases. Air going out a chimney = the same amount of air infiltrating someplace
Millions of homes have gas ranges and ovens with no vents and no problems..
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wrote in message

I've always wondered how safe these were...
Does anyone know if they are acceptable for use in Alberta, Canada (Calgary specifically)?
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