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Where Can Gas Logs Be Installed?
Learn how to determine if you can burn gas logs in your fireplace.

Believe it or not...gas logs, are not safe to install in gas fireplaces (with few exceptions). Sounds odd, but it's quite true. Gas logs are actually made to be installed in wood burning fireplaces as a way of converting them to gas. They are not made to "spruce up" a poorly designed gas fireplace like those you see in many condos and apartments...and yes, maybe even in your home. Bottom line is, if you install a gas log in a gas fireplace that was not designed to accommodate them, you might end up asphyxiating yourself or burning your house down. So before you buy gas logs, you must know what type of fireplace you have...and if it is safe to burn gas logs in it. The information on this page will help you do just that.

VENTED GAS LOGS: Vented gas logs can be installed in any fireplace that is fully capable of burning wood. Vented gas logs must be burned with the damper open (or partially opened depending on how well the fireplace drafts). Vented gas logs can also be installed in outdoor fireplaces and fire pits that meet local building codes. You CANNOT install vented gas logs in any gas fireplace or gas stove or ventless firebox.

VENTLESS GAS LOGS: Ventless gas logs can be installed in any fireplace that is fully capable of burning wood and are burned with the damper closed. Ventless logs can also be installed in some approved ventless fireboxes, providing the firebox is specifically rated for the use of aftermarket ventless logs and not a specific proprietary ventless log supplied by the fireplace manufacturer. A ventless fireplace has no chimney or damper. You CANNOT install ventless gas log in any other type of gas fireplace or gas stove. Important Note: Ventless gas logs are NOT legal in some states, cities or municipalities. You must check with your local building department to see if they are legal in your area. Ventless gas logs are not legal throughout the entire state of California!

How do I know what type of fireplace I have and is it safe to burn gas logs in it?

You need to know if you have a wood buring or gas burning fireplace. If it is a wood burning fireplace, then you can probably install gas logs in it. If it is not a wood burning fireplace, then you most likely CANNOT install gas logs in it (except for a few Ventless fireboxes as described below). If you do not know if you have a wood burning fireplace or not, the information on this page will help you make that determination, but first, look inside your fireplace to see if there are any metal parts aside from the damper. If there are, then it is probably some type of prefabricated fireplace. If that is the case, there should be a metal label with the brand name and model number located somewhere inside the fireplace. That label might also have some stipulations as to what you can burn in it. The label is usually somewhere near the opening, either on the sides (sometimes hidden by a mesh curtain) or on the upper front area just inside the opening. If you can find the label, try to Google the information on it to learn more about your fireplace. Often times you can find the owners manual online in a downloadable .pdf file. If you are still having difficulty determing what type of fireplace you have, just call us and we will help you figure it out. You can also take pictures of your fireplace and email them directly to me (the webmaster) at: gregt@hansenwholesale.com


Masonry Fireplaces:

OK for Vented Gas Logs
OK for Ventless Gas Logs

A typical masonry fireplace will have a firebox and chimney that is built from some type of masonry. For sake of discussion, a "Tilt-up" fireplace that is made completely out of concrete would be considered equivalent to masonry fireplace. Although the chimney outside the house may be covered with stucco, stone, or any other building material, the actual inside if the chimney on a masonry fireplace is often lined with an oval shaped clay flue liner, although some older homes do not have this. The flue inside the chimney of a masonry fireplace is usually rectangular or oval in shape and is normall 8" x 14" or larger (sometimes much larger). It is rare that a masonry fireplace has a flue that is smaller than this, so if your flue is smaller, then you may not have a masonry fireplace.

If your damper is a wide rectangular piece that opens and closes with a lever and your fireplace is capable of burning wood, then you have a masonry woodburning fireplace and it will be capable of burning vented or ventless gas logs. Always have your chimney inspected before burning wood in your fireplace or installing a gas log. If you have been told that there are cracks in your chimney and it is not safe to burn wood, then you cannot safely burn a vented gas log either because the exhaust may come into your home. In such cases, it may still be safe to burn a ventless gas log, but you must consult with a professional who is capable of inspecting your firebox and making the final determination.


Prefabricated Woodburing Fireplaces:

OK for Vented Gas Logs
*Maybe OK for Ventless Gas Logs

A Prefabricated (or zero clearance) wood burning fireplace is a metal box that is lined with refractory panels and has a round metal chimney anywhere from 8" to 15" in diameter. The metal box and pipe are built-in to the home with 2x4 construction and the chimney outside the house is usually covered with stucco, siding, or sometimes brick veneer or stone. If you have a round damper that is 8" in diameter or larger and your fireplace is capable of burning wood, then you have a prefabricated woodburning fireplace. This type of fireplace that can certainly accommodate a vented gas log and is burned with the damper open. You may also be able to install a ventless gas log into a prefabricated fireplace depending on the manufacturer and model fireplace you have. You must check with the owners manual to determine if ventless gas logs are allowed in your fireplace model. If the owners manual does not specifically state that you can install ventless gas logs, then you cannot There may also be limitations to the BTUs or the size of the ventless logs that the fireplace can accommodate, so be sure to check for that as well!

If you are still having difficulty determing what type of fireplace you have, just call us and we will help you figure it out. You can also take pictures of your fireplace and email them directly to me (the webmaster) at: gregt@hansenwholesale.com


Ventless Fireplaces and Fireboxes:

NOT for Vented Gas Logs
*Maybe OK for Ventless Gas Logs

Ventless (or Vent Free) fireplaces are similar to prefabricated wood burning fireplaces in that they are a metal box that is framed into your house with 2x4s. The big difference is that there is no chimney at all. Most ventless fireplaces come with a factory installed gas log and burner system and you cannot change it without causing serious safety issues. However, there are some ventless fireboxes that are specifically designed to accommodate an aftermarket ventless gas log of any brand. If you have the latter type, then you can use any of the ventless logs on our site, but you must be sure to consult the owners manual of the fireplace to find out what the size and BTU limitations are because there usually are such stipulations set by the factory and exceeding them can create a potential fire hazard.

You cannot install vented gas logs in a ventless fireplace under any circumstances.

If you are still having difficulty determing what type of fireplace you have, just call us and we will help you figure it out. You can also take pictures of your fireplace and email them directly to me (the webmaster) at: gregt@hansenwholesale.com


B-Vent Gas Fireplaces:

NOT for Vented Gas Logs
NOT for Ventless Gas Logs

B-Vent (or Natural Vent) Gas Fireplaces are built-in to your home just like a prefabricated wood burning fireplace. Many people mistake a vented gas fireplace for a wood buring fireplace, so it is very important that you double check to make sure you know what type of fireplace you have. The first clue that a fireplace is a B-Vent fireplace is the diameter of the flue. If the flue exits from the top of the firelpace and is less than 8" in diameter, then it is either a B-Vent or Direct Vent gas fireplace. In either case, they are dealt with the same way (see direct vent fireplaces below). A few gas fireplaces will in fact have an 8" diameter flue, which happens to be the same diameter as the smallest flue used in some wood buring prefab fireplaces. So you if this is the case be sure to check the owners manual if you are not sure if it is a wood or gas only fireplace.

B-Vent cannot handle the heat produced by burning real wood or gas logs nor is it capable of axhausting all the fumes. B-Vent gas fireplaces will come with factory installed gas logs that cannot be modified or changed in any way. If you do not like the way your gas fireplace burns, you will need to replace the entire fireplace. Important Note: You cannot install any of the gas logs on our web site in this type of gas fireplace. Doing so creates an xtreme safety hazard and can burn your house down!

If you are still having difficulty determing what type of fireplace you have, just call us and we will help you figure it out. You can also take pictures of your fireplace and email them directly to me (the webmaster) at: gregt@hansenwholesale.com


Direct Vent Gas Fireplaces:

NOT for Vented Gas Logs
NOT for Ventless Gas Logs

Direct Vent Gas Fireplaces are somewhat similar to B-Vent gas fireplaces except that the flue may be vented directly out the back and they have a sealed combustion chamber with a glass front that does not open. All direct vent gas fireplaces will come with factory installed gas logs that cannot be modified or changed in any way. If you do not like the way your direct vent gas fireplace burns, you will either need to replace the entire fireplace or contact the manufacturer to see if they have any available options for the logs. Important Note: You cannot install any of the gas logs on our web site in this type of vented gas fireplace. Doing so creates an extreme safety hazard.

If you are still having difficulty determing what type of fireplace you have, just call us and we will help you figure it out. You can also take pictures of your fireplace and email them directly to me (the webmaster) at: gregt@hansenwholesale.com


Wood and Gas Stoves:

NOT for Vented Gas Logs
NOT for Ventless Gas Logs

as logs cannot be installed in wood burning stoves or gas burning stoves. Wood stoves are designed to use far less air than wood burning fireplaces, so in most cases they have a 6" diameter vent that is not enough to properly exhaust the fumes given off by gas logs. Wood stoves generally tend to get hotter inside (because that is what they are designed to do) so the heat build-up can destroy the safety pilot assembly of a gas log. Wood stoves are also not tested and UL listed for use with gas logs, so not only will adding a gas log void the warranty of your stove (and gas log), if by chance the gas logs cause a fire and your home is damaged, it is possible that you will not be awared any adjustment from your insurance company. Gas stoves are just like gas fireplaces in that they are designed only to accommodate the gas log and burner system that they come with from the factory. The venting systems are not designed to handle the heat of a gas log and cannot exhaust the fumes properly. Using any other gas log in a gas stove than the ones that came with it can create a fire hazard or potential explosion. Important Note: Bottom line for wood and gas stoves is...you cannot install gas logs in them unless the manufacturer offers such an option, in which case you can only use those made specifically for your particular stove.


More details

This information was copied over from another location on our website, so although it repeats much of what is said above, there are some other tidbits here that may help you if you are still unclear about anything above.

VENTED gas logs can ONLY be installed in a fireplace that is fully capable of burning wood. That means that the chimney must be in good condition. So if you want to burn gas logs because you had you chimney inspected and were told it was not safe to burn wood because it leaks or something, then it is not safe to burn gas logs either.

Ventless gas logs can only be installed in wood burning fireplace OR a factory built ventless firebox that is rated for use with aftermarket ventless logs. Every ventless firebox has LIMITATIONS to how many BTUs are allowed and how large a log set it can accommodate. If you have a factory built ventless firebox, you MUST refer to the installation manual to get this information before you can know what will work.

VENTED gas logs flat-out CANNOT be installed in any Gas only fireplace. Although this sounds strange, gas fireplaces are designed to accommodate ONLY the log and burner combinations designed specifically for the particular appliance. Vented gas logs produce far more exhaust and require more draft than a gas only fireplace is designed to accommodate. They also may produce more heat than the venting system is rated for. Vented gas logs are NOT rated to be used with B-Vent period!

VENTED and VENTLESS gas logs CANNOT be installed in any Direct Vent gas fireplace. Direct vent fireplaces are the ones that have a sealed glass front. These are even more finely tuned to work only with the logs that they come with and it is quite dangerous to install anything in them other than what the manufacturer supplied with the unit.

Neither vented or ventless gas logs can be installed in any Wood Stove! Most wood stoves do NOT have a large enough diameter chimney to create a proper draft for a gas log. Wood stoves operate at a very low draft, which is what makes them desirable and efficient. Also, most wood stoves made in the last 20 years are not designed to be burned with the doors open, so gas logs are not appropriate just for that reason alone. Also, wood stoves are designed to capture more heat inside the burning chamber, so a gas log set would OVERHEAT inside a wood stove. Those who believe that a ventless gas log can work in a wood stove would be incorrect because of this factor alone. It is also rare that you can find a gas log small enough to fit properly into a wood stove. Regardless, you cannot install a gas log in any wood burning stove.

Free standing wood burning fireplaces, most commonly manufacturered by Malm, are treated just like a regular wood burning fireplace, so it is OK to install either vented or ventless gas logs in them if the fireplace and chimney is still in a condition that it is capable of burning wood.


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Answers to Recent Gas Logs Questions Posted To This Page
  1. Question #9479 - Posted: 4/8/2014 1:36:59 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/vented/model.asp?StyleCode=RDP&FPType=Standard&GasType=NG&Na...

    QUESTION: I am looking for Peterson Model # SDPG46-18-17, but I do not see it on your web site. Do you carry it?

    ANSWER: Yes, we do carry it. Here is a link: Peterson SDPG46-18-17 Split Oak Designer Plus

  2. Question #9475 - Posted: 4/8/2014 1:29:42 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/default.asp

    QUESTION: On a RH Peterson burner, what is the difference, or pros and cons from a G45A Burner and a G45 Triple T Burner? Is it just the certification or is there a performance difference as well?

    ANSWER: The G45A has a manual safety pilot that is factory installed and tested to meet ANSI approval. The G45 is a match-light burner with no safety pilot. If you purchase a G45 and add a safety pilot it will not be installed and tested at the factory. Otherwise, both burners are identical and both are Triple T. Many cities and states require ANSI approval, so if in doubt, it is best to purchase an ANSI approved burner.

  3. Question #9474 - Posted: 4/7/2014 1:30:01 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/model.asp?SetModel=PL-CHASG10-16&FRONTWIDTH=32&BACKWIDTH=20&...

    QUESTION: I have a zero clearance fire place that had the chimney removed when the house was re-roofed. I never intend to burn wood in it again. It never worked very well burning wood. Ventless is an option, but what are my options for a vented log? I would not want to take the vent through the roof. Can it be vented to a side wall? What are the limitations for running vent horizontally (how long)? I live in St. Louis, MO. Firebox can handle a G10 18

    ANSWER: There are no options to vent a previous wood burning fireplace out a side wall, it must be vented through the roof as it was before in order to burn any gas logs, vented or ventless. Please do not burn anything in your fireplace without having he chimney installed as it was before...it will not be safe.

  4. Question #9467 - Posted: 4/3/2014 7:53:00 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/installers.asp

    QUESTION: I am looking at model HRG45-24-P-SS. the gas line comes into the fireplace from the left side (looking forward at the fireplace). Will this burner-log set work? When I looked at the instruction manual, the diagram shows the gas line on the right.

    ANSWER: You can easily reroute the gas line to the left side using a longer flex tube or black pipe. Often times, depending on the location of your gas line, the flex tube that comes with the burner will reach the other side. If it does not, then you can purchase a longer flex tube from us or from a hardware store or home center.

  5. Question #9455 - Posted: 2/17/2014 9:10:47 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/vented/24-inch.asp

    QUESTION: Cn I just order the burner since I already have a 24 " split oak log set? My existing burner is leaking. Am looking at the G46-24 SPK.

    ANSWER: Yes, if you already have Peterson logs, we can supply you with the correct burner that is matched to them. The G46-24-SPK is one of the burners that is compatible with your logs. Give us a call and we will process your order over the phone. Call: 1-800-201-1193.

  6. Question #9454 - Posted: 2/17/2014 9:09:00 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/why-ventless-gaslogs-smell.asp

    QUESTION: Hello, Thank you for taking my question. We have install installed a ventless fire place Patterson.. The unit was complete but had no logs supplied. Bought new logs. Can any ventless log be used with the burner. Or are the logs and burner sold only in sets?

    ANSWER: Warning: Do not use any logs other than those designed for the particular burner you own. The logs are in fact specific to the burner. It is critical that you get the right logs because if the flame hits the logs differently than the original design it can cause the gas to burn incompletely. Incomplete combustion of gas results in the additional byproducts of soot and carbon monoxide (lethal and odorless), which will be introduced directly into your home.

  7. Question #9449 - Posted: 2/1/2014 3:26:13 PM

    Gas Logs Question

    http://www.hansenwholesale.com/answers.asp?ProdType=LOGS

    QUESTION: I have a Peterson 18" gas log set I'm installing myself. The installation manual shows a right hand gas supply. My fireplace has a left gas supply. Can I just disassemble the burner pan and convert it to a left gas input and put the cap on the right? Or do I need to run a lot more pipe all the way from the left side to the right side? Thanks

    ANSWER: If you have a matchlight system (one without a safety pilot) then you can switch the plug and orifice from one side to the other to convert it to left gas input. If you have a safety pilot, it depends on the pilot system you have: some of them can and other cannot be reversed...it will be obvious because the pilot mechanism would be upside down when reversed. If such is the case, then either get a longer flex tube from a home center, or reroute the gas line using black pipe and elbows.

  8. Question #9448 - Posted: 1/30/2014 9:12:57 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/why-ventless-gaslogs-smell.asp

    QUESTION: We have a "Fire-Gear" vent-less propane fireplace. It gives off a noxious odor. We had it service but to no avail. We are thinking of replacing it w Peterson brand. Will this take care of our problem?

    ANSWER: Fire Gear is not a top quality brand like Peterson, so it is quite likely that replacing them with a better quality vent free gas log from Peterson will help reduce the odor. But it is important to be aware that ALL ventless appliances produce some odor because all of the byproducts of burning the fire are introduced into the room. Propane can be particularly worse than natural gas because the quality of the propane varies from supplier to supplier. The more impurities there are in the propane, the more potential there is for smell coming from burning a ventless gas log. Although we would love to sell you a new gas log set, we cannot guarantee that it would eliminate or reduce the odor. The only way to find out would be to install them. At least in that manner, you would know for sure whether it is the log set causing the problem, or the gas you are being supplied. Read more about what causes vent-free gas logs to produce a smell:

  9. Question #9447 - Posted: 1/30/2014 8:46:17 AM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/vented-vs-ventfree.asp

    QUESTION: My daughter has vented gas logs in her bedroom which is about 24x36. It is her primary heat system. Recently we noticed that the ceiling and top part of her walls were becoming covered in black soot. Why would the logs start this and is it dangerous to them. They have a 1 month old that sleeps in that room as well. I have noticed that some of the baby toys that are plastic have the black on them also. I am very nervous about this. Would it be better for them to get ventless with a heatalator?

    ANSWER: Please stop using the gas logs immediately, it is dangerous to use them if they are producing soot. Where there is soot, there is also carbon monoxide, which as you know is a lethal odorless gas. You need to have your gas logs serviced or replaced because they are no longer burning cleanly as vent free gas logs should. Some Heating and AC companies are qualified to service ventless appliances, so use your local yellow pages to call around. Or, you can use the resource on this page to locate a professional who is qualified to service your gas logs: Locate a Gas Log Service Professional.

  10. Question #9446 - Posted: 1/26/2014 3:14:39 PM

    Gas Logs Question

    http://www.hansenwholesale.com/gas-logs/ventless-btu-calculator.asp

    QUESTION: I have a Peterson real fire vented gas log system 18inch in my fireplace for several years and am very satisfied. I would like to change just the burner to make a vent free system for more heat. Is this possible. Thanks

    ANSWER: Unfortunately you cannot change just the burner in order to create a ventless gas log set. The burner and logs must be designed to work together, so you will need to buy a complete setup. The reason is that ventless gas logs must burn in a very controlled manner in order to burn cleanly. Any disruption to the way the flame burns, such as touching the logs in the wrong place, will cause the gas to burn incompletely and produce exhaust...including carbon monoxide and soot. So the flames cannot touch the logs in any manner in which the system was not designed...which means you must have the correct logs and they must be stacked exactly as described in the owners manual.

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Ventless gas logs are burned with the damper closed. They look less realistic but produce more heat.
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