Gas Logs: Vented or Vent-Free? How To Tell The Difference, and Decide Which One You Need.


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Jim from Fleet-Plummer describes the difference between vented and vent-free gas logs so that you can determine which type might best suit your needs.

Founded in Greensboro, NC, in 1949 by 21-year-old Charlie Plummer, Fleet-Plummer is a family-owned specialty gift and home store with the most knowledgeable salespeople in areas of gas logs, grilling, outdoor furniture, and more.

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Captain Void says:

Nice explanation, thank you.

gary5209 says:

Ok help me out here, I just purchased a new pleasant hearth ventless fireplace and turned it on and the flames are blue and cannot be seen as well as the ventless models you show. I call the manufacturer and they said the flames were supposed to be blue. I am very disappointed because that’s not what they showed in their pictures. How can I make my flames yellow like yours? Thanks Gary

mwright443 says:

Vented fireplaces are best equipped with a blower and then are much much more efficient then a ventless. A ventless fireplace is more for visual as they consume the oxygen in a room and are not intended to be operated more than 30 to 45 minutes at a time. Also ventless fireplaces typically put off a smell and can turn your walls and ceilings black if used very often over the years of owning one. Be very careful with ventless fireplaces, they are usually pushed because they are cheap to install (No vent to the outside) and consume air in your home which can really dry the air.

PD Conley says:

Great video, very informative.

kzachary395 says:

Very informative video

Clay Lamb says:

Jim , this is a VERY nice explanation of the differences between vented and vent-free gas logs!!!!!!
 I will be putting on the TV our stove shop.

C.R.E.A.M. says:

this guy is awesome

Lula Zeta says:

Unvented logs then do not require that the damper is open while operating?  Also, gas logs always run with “natural gas”? I guess I need to find out different types.

JIV3 says:

thank you for the informative insight!

K Yancy says:

Great video! Thanks for the post. I’m still not 100% sure what we have so going to err on the side of ‘vented’ just for safety’s sake.

Our fireplace was originally a wood burning unit that was converted to gas some 15+ yrs ago so I have no manual and the only mfg plate I can find within the unit still refers to the wood burning model/specs.

There is no fancy pilot light or similar devices. To light them I have to use a key to open the gas just a bit, then light with a long match or similar before increasing the gas by turning the key. This suggests to me that since is so low tech, they probably are vented.

I have always just treated as vented for this reason, but as you noted, when we burn it that way it’s never really heated the room and would be a pity if we’ve been wasting all that heat up and out the chimney for no reason, so thought I’d check and see what info I could find about them. Thanks again for the post.

Sunday Times says:

Excellent information! Thanks very much.

Anne Reaves says:

Great video Jim….such a pro!

herpderpmonkey says:

man this guy knows his gas-powered fireplaces!

Fernando Rodriguez says:

Also should my damper be kept close in the summer, btw I’m in Texas.

Wesley Johnson says:

Excellent video Jim. This was very helpful.

Mike Jolly says:

great information

seattwa says:

Very straight forward usefull information. To bad somebody can’t come up with a combination of the two, realistic fire of the vented and heat of the ventless. And come up with a damper that can be closed.

hispeed69 says:

Best explanation I’ve seen! Great voice… Hope you’re getting some commission from your manufacturers for that great commercial pitch! Can you tell me if they have a system with a blower fan to better move the heat it produces from the ventless system?

C Bales says:

I have a gas fireplace, I’ve had wood stoves in the past, there’s a key mechanism to the right of the log stack inside the fireplace. I also have a light switch style mechanism to the right of the fireplace to turn on the vent. I don’t know when the fireplace was serviced last, is it okay to try and light or do I need a professional to survey it first? Thank you in advance.

INGRAM says:

You sir, indeed have a great speaking voice. I’ll bet you were in radio at one time. You would make a great story teller for my little guy…thanks, excellent video.

Mary Herje says:

Could you explain how the vent-free logs work? I do not understand.

I see it would make sense to have a ceiling fan or other way to circulate the air.

Peggy Berger says:

Very helpful … thank you. I must have vent free because it made the room VERY HOT. I disconnected it for that reason. Can I assume that I could replace that set with a vented set? There is no chimney. But of course the natural gas comes in from the outside. Thank you.

Nikola Tesla says:

Byproducts of natural gas include carbon dioxide and water vapor.
Complete combustion of gas produces a harmless mixture of these two
byproducts. However, when a fuel is burned without proper air for
complete combusion, a toxic gas called carbon monoxide may be produced.

Fernando Rodriguez says:

How would I know which type I have, since I just moved in

peacola says:

You sir have a great speaking voice. Very informative video.

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