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  1. #1
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    Oct 2008
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    Gas Log Question

    I'm planning on installing a gas fireplace log in to a Superior wood fireplace that is prepped for a gas log. I would like to get some heat out of the fireplace and I read that a vent-free unit would do that. But vent free supposedly produces an odor. My fireplace has a capability of bringing in outside air thru a vent controlled by a push/pull lever by the left side of the glass window. Will having this vent open help prevent the odor and make the fireplace more efficient?

  2. #2
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    You have a vented fireplace, why not a non vent free logset?

    Vent "free" just means the products of combustion including copious moisture are vented into the living space....

  3. #3
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    Thread Starter
    Quote Originally Posted by Juan Madera View Post
    You have a vented fireplace, why not a non vent free logset?

    Vent "free" just means the products of combustion including copious moisture are vented into the living space....
    Yes, I know a vented unit would be the logical way to go. But never having had a gas log before I thought the heat would just all go to the flue while my understanding is as vent free unit would give out heat (with the flue damper closed). That is why I am asking the experts.

  4. #4
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    Vent free is a euphemism for “my house is a chimney.”
    Do you heat your garage by running the car in it?

    In case I’ve been too subtle, I disapprove of ventless heaters.
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  5. #5
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    Jan 2019
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    You can't have a fire in your living room with no vent and not have an odor.
    Vent free= bad idea. If you want heat look into a direct vent gas insert. A lot more money but worth it

  6. #6
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    Least case issue with "Vent free" is you get a TON of moisture in the home... Might be a good thing if you have a drafty old victorian. But, if you have a modern relatively tight home, expect a lot of condensation on the windows, wood rot, and mold.

    I like the Petersen real fire logs on a sand pan. Looks like the real thing. If your firebox is glass door and relatively airtight, you should get some heat out of it.

  7. #7
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    Quote Originally Posted by kdean1 View Post
    Vent free is a euphemism for “my house is a chimney.”
    Do you heat your garage by running the car in it?

    In case I’ve been too subtle, I disapprove of ventless heaters.
    Hos 4:6 My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you, that you may be no priest to me. Because you have forgotten your God’s law, I will also forget your children.


    "You've got to Stand for Something or You'll fall for anything" (A. Tippin)


    Mat_15:24 But he answered, “I wasn’t sent to anyone but the lost sheep of the house of Israel.”

  8. #8
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    Quote Originally Posted by Juan Madera View Post
    Least case issue with "Vent free" is you get a TON of moisture in the home... Might be a good thing if you have a drafty old victorian. But, if you have a modern relatively tight home, expect a lot of condensation on the windows, wood rot, and mold.

    I like the Petersen real fire logs on a sand pan. Looks like the real thing. If your firebox is glass door and relatively airtight, you should get some heat out of it.
    Hos 4:6 My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you, that you may be no priest to me. Because you have forgotten your God’s law, I will also forget your children.


    "You've got to Stand for Something or You'll fall for anything" (A. Tippin)


    Mat_15:24 But he answered, “I wasn’t sent to anyone but the lost sheep of the house of Israel.”

  9. #9
    Join Date
    Feb 2019
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    Stockholm
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    I think at the beginning it is necessary to think through the ventilation, and then install a fireplace. In my opinion, it is logical: D
    Also, keep in mind that if the thrust in the air outlet is not enough, then you really start to have problems in the room, from smoke or moisture.

  10. #10
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    Aug 2004
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    A vented logset requires the damper be blocked wide open to maintain a stated "minimum permanent net free opening" which usually starts around 50 square inches. That equates to an 8" flue. Wide open. 24/7. You can install glass doors if they are listed for use with that fireplace but not aftermarket doors. That will minimize the loss of heated room air up the chimney when off duty but the doors must be wide open while burning.

    A ventfree set has many special requirements. For starters your fireplace must be listed for use with VF. If it was built prior to May 1999, it can't possibly be listed for VF because that's when UL127 first offered the optional VF test. Not all units are listed for VF. You typically have to install an ugly canopy or hood across the opening if the mantel is less than about 14" away. As noted, when you burn for 3 hrs. at 33,000 BTU/hr. you've made one gallon of water. Yes, VF will stink. No, the combustion air kit will not help and could hurt if its on the downwind side. Those factory built fireplaces were not designed for heat output but convenience. If you really want heat, replace it with a listed hybrid half fireplace/ half woodstove that will legally and relatively safely cook you out of there.
    HTH

  11. #11
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    Mar 2015
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    Quote Originally Posted by hearthman View Post
    A vented logset requires the damper be blocked wide open to maintain a stated "minimum permanent net free opening" which usually starts around 50 square inches. That equates to an 8" flue. Wide open. 24/7. You can install glass doors if they are listed for use with that fireplace but not aftermarket doors. That will minimize the loss of heated room air up the chimney when off duty but the doors must be wide open while burning.

    A ventfree set has many special requirements. For starters your fireplace must be listed for use with VF. If it was built prior to May 1999, it can't possibly be listed for VF because that's when UL127 first offered the optional VF test. Not all units are listed for VF. You typically have to install an ugly canopy or hood across the opening if the mantel is less than about 14" away. As noted, when you burn for 3 hrs. at 33,000 BTU/hr. you've made one gallon of water. Yes, VF will stink. No, the combustion air kit will not help and could hurt if its on the downwind side. Those factory built fireplaces were not designed for heat output but convenience. If you really want heat, replace it with a listed hybrid half fireplace/ half woodstove that will legally and relatively safely cook you out of there.
    HTH


    We are hoping to have our remodeling done here before next winter, where we can burn wood, cook on the stove if necessary, & possibly employ some kind of coil to assist in our DHW needs.

    After several severe ice & wind storms, it hit me, "What If", the power went out for longer than a week, & "What If", propane couildn't be delivered.

    With the great abundance of firewood available here, ..... We're going to go Wood.
    Hos 4:6 My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you, that you may be no priest to me. Because you have forgotten your God’s law, I will also forget your children.


    "You've got to Stand for Something or You'll fall for anything" (A. Tippin)


    Mat_15:24 But he answered, “I wasn’t sent to anyone but the lost sheep of the house of Israel.”

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