By Mike from PA on January 27, 2013
I currently have a B vent wood burning insert that leaks a lot of cold air . I want to replace it with a vented gas insert but what keeps cold air from infiltrating the unit from the vent when not in use? I'm going to use it very sparingly, should I just buy a non vented one because I'm more concerned about air infiltration.
By Collin C. - NFI Master Hearth Professional on January 28, 2013
Answer:If the current unit is replaced with a direct vent fireplace, the combustion chamber would be sealed and would eliminate any cold air intrusion from the fireplace. Vent free is indeed another option that could also be considered. Do you plan on removing the current unit complete and replacing it or are you looking for a true insert that could be installed into the existing fireplace?
By Kandy from St. Pauls, NC on September 11, 2013
I am installing a gas log insert in my wood burning fire place. Can the controls be mounted inside the glass, or do I have to find a way to put them outside the fireplace walls?
By Collin C. - NFI Master Hearth Professional on September 11, 2013
Answer:The control valve itself can be located within the fireplace glass enclosure, as they are designed to deal with the heat. However, if you utilize a remote ready set, the remote receiver will need to be located outside of the glass, as it can be damaged by overheating.
By Peggy from Salisbury, MD on December 10, 2013
Is there any regulation regarding how close to a window you can place a gas(propane) fireplace? I would want a vented one as I hear too many issues with non vented.
By Collin C. - NFI Master Hearth Professional on December 11, 2013
Answer:By national code for direct vent fireplaces, the edge of the vent termination can be no closer than 12 inches to a door or a window. Most terminations are approximately 12 inches across, so the center line of the vent passing through the wall would need to be approximately 18 inches from the edge of the nearest door or window.
By June from MD on June 10, 2013
Does an indoor/outdoor fireplace give off heat on the outdoor side?
By Collin C. - NFI Master Hearth Professional on June 10, 2013
Answer:An indoor/outdoor fireplace will indeed give off a limited amount of heat on the outdoor side. However, the unit is primarily intended to viewing aesthetics, as the sealed outdoor conversion window limits a great deal of heat from being transmitted by circulation. Only radiant heat will make its way to the immediate area.
By Lauren from New Jersey on November 29, 2013
I am looking for an enclosed direct vent gas unit to replace my current old Superior wood burning unit. The opening size is 38" wide x 31" high. Is it possible to use one that is 36" wide in this space? This seems to be a much more popular size with many more choices.
By Collin C. - NFI Master Hearth Professional on November 29, 2013
Answer:It is indeed possible to use a 36 inch unit in your application. This size is indeed one of the most widely produced and most popular sizes. It may be necessary to reduce the framed opening, once the old Superior unit has been removed, but this will depend on how much of an overall size difference the new unit will have.
By Michelle from Queens, NY on March 1, 2013
Can I have a vented fireplace not on an outside wall, but vented to the outside side of my house , which has vinyl siding? Where I live, can I have a vent free fireplace? Which type gives off more heat?
By Collin C. - NFI Master Hearth Professional on March 1, 2013
Answer:A direct vent fireplace can be installed on an inside wall and horizontally vented, however you will need to ensure that you have space in the adjacent area for a venting system to be enclosed in a chase wall.
In regards to the vent free fireplaces, contact your municipal code office to verify that they can be used, as state and local guidelines can differ.
By Michael from Parkersburg, WA on September 21, 2013
I am looking for a gas fireplace for my bedroom that is direct vent with accent lighting. Do you have any besides Napoleon?
By Collin C. - NFI Master Hearth Professional on September 23, 2013
By Carolyn from OH on April 2, 2013
I'm looking for a narrow direct rear vent fireplace, which doesn't need to be recessed into the wall. What model do you suggest for an 18' x 18' bedroom?
By Tyler M. - NFI Certified Specialist on April 3, 2013
By Jacqui from Newport Beach, CA on September 13, 2013
I'm looking for a contemporary fireplace, natural gas, with logs. Any recommendations?
By Collin C. - NFI Master Hearth Professional on September 13, 2013
Clean face fireplaces offer a more contemporary look, but still have the traditional log sets available. A popular model we offer is the Napoleon BGD36CFNTR Clean Face Direct Vent Gas Fireplace - 36-inch
. The clean perimeter can be likened to a picture frame and gives the face of the unit an uncluttered look. Another popular unit that features a larger opening is the Napoleon HD35 Direct Vent Clean Face High Definition Gas Fireplace
. The taller opening and high definition burner put focus on the log set, while keeping the same clean face lines that help the unit blend in with contemporary decor. I will be happy to answer any questions you may have about either model.
By Ella from CA on August 16, 2013
If I am installing a direct vent fireplace on an interior wall, does that mean I need a top vent as opposed to a back vent?
By Tyler M. - NFI Certified Specialist on August 19, 2013
Answer:Yes, likely you will need to run the venting vertically over your roof. Please check with the manufacturer for specific venting installation information.
By Brent from Stafford, va on September 1, 2013
Looking for a direct replacement for a BCF-3885 wood burning insert. I would like a gas insert instead. Do you have any that are close in size?
By Collin C. - NFI Master Hearth Professional on September 3, 2013
One model we carry that is an almost perfect match to your current fireplace is the Napoleon BGD36CFNTR Clean Face Direct Vent Gas Fireplace - 36-in.
. This model could serve as a good replacement with minimal reframing necessary from removal of the current model. If you require a model will higher heat output, I will be happy to research other models that may work for you.
By Melissa from Phoenix on November 24, 2013
I have the original gas burner/pipe (not sure what its called) and attached tray from the previous home owners. We were then given a grate and vented gas logs from my parents. From the pics below, the fire obviously looks fake. What materials can I put underneath the grate where the gas flows so it looks real? Basically, do you have any suggestions on how to make this fireplace look better without spending too much money?
By Collin C. - NFI Master Hearth Professional on November 25, 2013
The design of your burner pan calls for use of either sand or vermiculite to help diffuse the flame, then glowing embers can be poured across the top of the material to give a more realistic appearance. If you are using liquid propane, the pan should be filled with Real Fyre Vermiculite Granules - LF-15
. If you are using natural gas, it should be the Real Fyre Select Sand - CS-10
. After either product is used, the system should be finished out with the Real Fyre Ember Glow - EM-1
By Gary from PA on February 9, 2014
Do you make Conner vent free natural gas fireplaces?
By Collin C. - NFI Master Hearth Professional on February 10, 2014
By Bernadette on November 9, 2012
Is it possible to convert the old fireplace in my 1889 house to gas and keep the old look and style?
on November 9, 2012
Answer:This will depend entirely on the size and condition of the existing fireplace and its associated chimney. There are many specialty log systems and gas coal baskets that are intended for smaller fireplaces that previously burned wood or coal.
What is the opening size of your fireplace and is the chimney in good working condition? Please advise.
By Michael on November 9, 2012
I'm looking for a direct vent gas fireplace, something low height and wide that can be down-vented (power vented). Have you any?
on November 9, 2012
By Clyde on November 9, 2012
We have a wood burning fireplace in our home. We are planning to remodel the family room. One of the things wrong with the room is that the fireplace is not in the center of the wall and it is not eye-appealing. The face of this fire place measures: 40" w x 38.5" h. The inside measures: 29" w x 19" h. I would like to put in a smaller natural gas insert into this space. The chimney is fireplace sis vent pipe. Is this feasible to put a smaller fireplace into this opening?
on November 9, 2012
You would indeed be able to install a natural gas insert into your existing fireplace, given that it is rated for use with an insert. Of course, installing an insert into this unit would not correct the off-center concern that you are experiencing with your current fireplace. Are you interested in a direct vent insert or a vent-free model? Please follow the below link to view a direct vent model that would work in your application.
Direct Vent Fireplace
Of course, if you opt for direct vent, new venting would need to be installed along with the insert. Please let us know if you have any additional questions.
By Dan from Reading, PA on March 4, 2013
I am looking to replace an old vent free corner mounted LP operated fireplace. The opening on the existing surround (cementaceous board with a brick face) is 34 inches wide by 28 inches high. The mantel should have adequate space for a 32 inch model. I could not find remote operated information on most of the product descriptions, but would like to have that option. The primary purpose of this fireplace is occasional usage and power outage backup heating capability. Could you please direct me to fireplaces that fit this description ?
By Kevin E. - Fireplace Specialist on March 5, 2013
We do indeed have a unit that should work well for you. Our Monessen DIS33
fits both your dimensional criteria and your desire for a remote.
By Antoinette on November 9, 2012
What is the difference between natural vent and direct vent? We want to vent it out through a PVC pipe instead of a chimney. I am interested in using a gas fireplace to heat a 1900 sq ft. basement. I would like it to be efficient and pretty. We have natural gas. We want to also have a thermostat and fan. Can you also explain the benefits and concerns of pilots vs. electric start or some other starter? Wall controls are also helpful. Can you let me know what else I would need?
on November 9, 2012
We get this question often, and you can see it explained in complete detail in our Gas Fireplace/Stove Buying Guide:
Gas Fireplace/Stove Buying Guide
Unfortunately, with both types, PVC pipe cannot be used. Natural vent units require Type B gas vent pipe, whereas direct vent units require coaxial pipe (pipe-within-a-pipe).
The application you have calls for a large, upscale unit to provide this kind of heating. Given that you need heat, you will need to go with a direct vent unit, as natural vent/B-vent fireplaces are very inefficient. Please see a few recommendations below:
Direct Vent Unit
Direct Vent Unit
Direct Vent Unit
The first and third units on that list will provide the most heat. All three units have electronic ignitions with a battery back-up. The advantage of this is there will be no standing pilot, and therefore no unused gas expenditure. The only items required for installation that are not included will be the venting pipe, which are all available on each item page in the "Venting Components" tab.
By Mary on November 9, 2012
Do you carry FMI Craftsman Renaissance 42” fireplaces?
on November 9, 2012
By Joseph on November 9, 2012
How does one clean the brass or gold plating on the front of the fireplace? I am afraid to use anything too harsh.
on November 9, 2012
Answer:A standard brass cleaner should work perfectly well for this application.
By Steven from Longmont, CO on December 1, 2013
I am looking for a B-Vent, Natural Gas unit. The measurements of my area are 40.5" W x 38.75" H x 26" D. I am looking for one with or without a blower.
By Collin C. - NFI Master Hearth Professional on December 2, 2013
A model that we offer that is very close to your framing width and height limitations is the Keystone Deluxe B-Vent Louvered Gas Fireplace - 36"
. The unit has a louvered face, allowing the ability to add a blower to circulate heat, if you wish to do so.
By Chris on November 9, 2012
We have a propane vent-free fireplace by Kingsman. The fireplace was already in the house when we bought it new, so we were the first to use it. From day one it has made a hissing sound when the burner and flames are on. We had someone come out to look at it and he said that is “normal!" It was not the pilot light, nor the burner, not the flex hose or the air coming into the house from the gas line. I have seen other people’s fireplaces and have NEVER heard a hissing. Could you possibly tell me what it might be? Could the brand we have be “cheap”, not well made? We are also considering purchasing a new insert, but have no idea which manufacturer is best. Any guidance would help - websites or someplace we could go for further research would be helpful.
on November 9, 2012
Answer:I apologize for the issues you are having with your fireplace. Kingsman usually makes good quality products and I have heard little negative feedback about them. Hissing is usually caused by high gas pressure or a kink in the supply line, but it sounds like you have already had the unit thoroughly checked over.
The Monessen and Napoleon lines that we carry are both good quality lines that offer a considerable bang for the buck. Being vent free, I am assuming that this unit would be intended primarily for heat.
By Gerry from Calgary, Alberta on April 5, 2013
I have an LHD50 Napoleon FP, I would like to purchase a fan assemble to direct warm air in the cavity in and around the FP. I have lots of void space behind and on the sides and would like to pull air from the room and push it thought this space to warm up and discharge back into the room. Could you recommend a kit to use? The LHD has plug in for a fan on the control module, can I use this to control? If I can, will I be able to get a variable speed?
Thanks in advance for your help.
By Collin C. - NFI Master Hearth Professional on April 8, 2013
Answer:Per the manufacturer, the LHD50 does not have provisions for a circulating blower to be used. The control module does indeed have an A/C adapter on the control module, but this is intended for use if the fireplace is equipped with a power vent, which aids in drafting issues.
It may indeed be possible to pull heated air from the cavity surrounding the fireplace by installing a custom plenum and fan, but this would need to be something fabricated by a contractor on site.
By Kristina from Arkansas on December 26, 2012
Can you place a flat screen TV above a vent free fireplace?
By Tyler M. - Fireplace Specialist on December 27, 2012
Answer:There is no clear answer on this; it depends on the fireplace model (BTU output) and how your television is installed (recessed, wall mount, etc.). The majority of heat from a vent-free fireplace comes out right at the top of the opening, going upward. As such, vent-free fireplaces are equipped with hoods to help deflect this heat.
Further, some units have the option to add a blower, which will help push some of that heat out into the room. Fireplace manufacturers do not test or list their models for use underneath any television, due to the sheer volume of flat screen/plasma/LED models on the market.
Our best recommendation is to put the television as far above the fireplace opening as possible and to recess it into the wall (if possible), and check for an extended hood option on the vent-free fireplace for additional help in deflecting the heat.
By Tom Colatrella from Allamuchy, NJ on November 28, 2012
Can a Majestic SC36 with gas insert be used for wood burning by removing the gas unit?
By Tyler M. - Fireplace Specialist on November 28, 2012
Answer:Yes, the SC36 is a wood-burning fireplace that is designed to burn wood. As such, if all gas components are removed, you can indeed burn wood in the unit, provided the Class A chimney system is in good shape.
By Barb dion from Milwaukee on October 22, 2012
I am looking at an old home with an artificial fireplace. I would love to make this gas-fueled because it's a perfect place for it. Would this be possible? Could I use the existing space?
By Kevin E. - Fireplace Specialist on October 23, 2012
Answer:Is your intent to completely remove the existing fireplace? If so, then yes. It would be absolutely possible to frame in a new fireplace in place of the old unit and run the necessary vent pipe for this new appliance. If you're planning for a direct vent fireplace, venting could be as simple as terminating horizontally right through the exterior wall.
By John from Hopatcong, NJ on October 2, 2013
I like the look of a linear gas fireplace like the Napolean LHD50, and plan to install a unit like this in a new construction house. I have a direct vent already in my plans. My concern is not having a blower unit which really helps with the heat. Do you have any suggestions?
By Tyler M. - NFI Certified Specialist on October 2, 2013
The Napoleon LHD50 direct vent fireplace
does not feature a blower, but it has a BTU rating of 30,000, which is a good amount of heat (suitable to heat approximately 800 square feet). We do have another large linear direct vent fireplace that can be equipped with an optional blower--the Majestic 60" Echelon
unit. That model is actually a bit smaller than the LHD50, with a viewing area width of 47 7/8", but it has a more powerful burner--up to 45,000 BTUs for natural gas (40,000 for propane), and it can be equipped with an optional blower.
By Bob from Natcyez, MS on March 6, 2014
I have a 42" FMI Zero Clearance vented firebox. The unit was installed in December 2013. Black soot or carbon formed on the logs almost immediately. Is this common?
By Kevin E. - NFI Certified Specialist on March 6, 2014
Answer:Have you installed a vented gas log set into this firebox? If so, is your fuel supply natural gas or propane? The sooting may be caused by flame impingement or maladjustment of the air shutters on the burner assembly. Flame impingement can be resolved by re-positioning the logs to prevent contact with the flames.
By Connie from Texas on January 22, 2013
I would like to have a propane vent free fireplace insert with an electric start instead of a pilot light. Is there such a thing? Do you carry them?
By Tyler M. - Fireplace Specialist on January 23, 2013
While finding a propane, vent-free unit with an electronic ignition is rare, we do offer this model:
Napoleon WHVF31 Plasmafire Wall-Mounted Vent-Free Gas Fireplace
This is a wall-mounted unit, and if you need an insert--a unit that slides inside an existing brick/masonry fireplace--we do not have anything with an electronic ignition, all of ours have a standing pilot light/millivolt ignition.
By SS from Fontana, CA on November 25, 2013
I have a gas floor furnace. Is it possible to convert it to a gas fireplace? If so, is it expensive and will it still heat my small 1000 sq. foot home as well? Could it easily be moved to a different wall in the same room? Is it possible to do the double sided fireplace?
By Collin C. - NFI Master Hearth Professional on November 26, 2013
By Greg Perkins from Whitefish, MT on November 8, 2012
I am looking for a vented gas fireplace to install in a new cabin as a secondary heat source. I want a unit 36" - 38" wide and a maximum of 25 1/2" high. I also want the full-view louverless design. Can you recommend some models?
By Collin C. - NFI Master Hearth Professional on November 8, 2012
Some of our more popular models of "clean face" direct vent units are the Napoleon BGD36CFNTR
as well as the Monessen Belmont
. Both of these models feature the clean face design and sizing you are described.
We also offer cost effective alternatives, such as the Empire Tahoe
. Please let me know if you have questions about any of these models.
By herb miller from Minneapolis on February 23, 2013
I have a Majestic MBUC36 zero clearance fireplace that has been used as a wood-burning fireplace. I'm interested in turning it into a gas fireplace. Can this unit be converted without replacing it?
By Collin C. - NFI Master Hearth Professional on February 25, 2013
Answer:The MBU and MBUC fireplaces are indeed able to be used for gas burning applications. The units come manufactured with gas line knockouts made into the chassis of the fireplace, allowing you to route a 1/2 or 3/4 inch supply line into the unit for a log set.
However, I recommend having a plumber evaluate the potential for installing the supply line. Depending on how the fireplace was installed, it can be difficult to run the supply line after the unit was finished.
By Carl from Leander, TX on May 29, 2013
What is the tallest viewing area available on a 42" gas direct vent unit?
By Tyler M. - NFI Certified Specialist on May 30, 2013
By darrel from Monticello, MN on October 24, 2012
Do they make a wood-liquid propane-gas combination fireplace?
By Kevin E. - Fireplace Specialist on October 25, 2012
Answer:A true dual-fuel fireplace is not available. The appliance would have to be dedicated to either wood or propane. However, there is an option to add a gas log light to many of our wood-burning fireplaces.
By Dakota from Denver, CO on March 25, 2014
What is the difference between the Napoleon BGD42N and the Napoleon BGD42-D models?
By Collin C. - NFI Master Hearth Professional on March 25, 2014
Answer:The standard BGD42N is a standing pilot model, while the BGD42-DE uses electronic ignition instead. The electronic ignition version is a good fuel saving appliance, but standing pilot models tend to do better in cold climates and are generally more reliable.
By John from Long Island, New York on December 3, 2013
I'm looking for a complete set for a Natural Gas B-Vent Fireplace with Fire Box, Log Set, and a Cabinet/ Mantel. Does such a unit exist or is it built as a kit?
By Chris on December 3, 2013
Answer:While we do offer the fireplace to include the firebox, burner, and log set, we do not have any pre-built units with a mantel included. However, we do offer several direct vent and vent free fireplaces that offer these mantel cabinets as accessories.
By Cory from SIlver Spring, Maryland on February 14, 2014
Looking to buy a 36 inch direct vent gas fireplace. Would have gone with vent-free (which is allowed in my state of MD), but I do not want a controversial item that might slow sale of house whenever that happens.
Need to know if you are in partnership with an installer in Maryland.
By Collin C. - NFI Master Hearth Professional on February 14, 2014
Answer:My apologies, but we do not maintain a working relationship with any installers in your particular state.
By James from Bay Shore, NY on March 26, 2013
Whats the difference between a "fireplace" and a "firebox"?
By Tyler M. - NFI Certified Specialist on March 26, 2013
Answer:Generally, when an item is listed as a "firebox," it will not include a gas burner or a log set, whereas a "fireplace" will include the firebox, the burner and the log set. Every unit on our website should clarify what is included, but if you have any questions about a specific item, please let us know.
By Donald from Homosassa, Fl on November 26, 2013
Do you have a blower kit for a Napoleon GVF36?
By Tyler M. - NFI Certified Specialist on November 26, 2013
By Dave from Lacey, Washington on November 22, 2013
I have a 10 year old Majestic gas fireplace, model 36BDVT. Is there any way to increase the heat output of this fireplace? I have ordered a fan kit, however, the flames do not seem to be very hot.
By Collin C. - NFI Master Hearth Professional on November 22, 2013
Answer:This unit is an 18,000 BTU unit and has a fairly low A.F.U.E. rating. As such, it is definitely not a high output unit and is only able to heat a limited space. The manufacturer did not produce an optional burner or orifice for this model. I'm afraid that there is not a way to boost output on this model without replacing it with a more efficient or higher BTU input unit.
By Glenda from GA on August 9, 2013
What mantel do you have that will go with the Napoleon BGD36CFNTR Clean Face Direct Vent Gas Fireplace with Electronic Ignition- 40 Inch?
By Kevin E. - Fireplace Specialist on August 9, 2013
There are a few options available. You may choose from either our Princess
, or our Georgian
for rear vent applications.
By Jim Vaught from Edmond, OK on December 19, 2012
I have a masonry wood-burning fireplace that we use with a vented gas log (natural gas). I would like to have something that would get the heat back into the room. Any suggestions on products or where to look?
By Collin C. - NFI Master Hearth Professional on December 20, 2012
The only product on the market that can be used with a masonry fireplace is a grate heater. An example is the Stoll 20 in. W x 17 in. D Grate Heater for Vented Gas Logs
. The heater would take the place of your current grate and would provide circulation of heat to the room.
The product uses a heat exchanger system to pull heat from the grate and force air through a tube at the front of the assembly. The unit can also be used in conjunction with many styles of glass door enclosures.
By Al from Overgaard, AZ on June 29, 2013
What propane corner fireplace will heat 800 sq ft and can be installed in a manufacturer home?
By Collin C. - NFI Master Hearth Professional on July 1, 2013
By Ginger from NM on August 11, 2013
When a fireplace is advertised as a 24" or 32" fireplace, does that just mean the box? or the complete unit with surround?
By Tyler M. - NFI Certified Specialist on August 12, 2013
Answer:This varies from manufacturer to manufacturer. By and large, the measurement refers to the front width of the fireplace face, including the sides, but in other cases it is the opening measurement. For every fireplace on our website you can download the owner's manual and see the illustrated dimensions which will clarify this.
By Mindi from San Jose, CA on October 21, 2013
I am building a house in Campbell, CA. What type of fireplaces are approved in CA? Only Direct Vent?
By Collin C. - NFI Master Hearth Professional on October 22, 2013
Answer:Either direct vent gas fireplaces or EPA tier II wood burning units are able to be used in California. Vent free, EPA tier I, and EPA exempt appliances cannot be shipped to or installed in that state.
By Nancy from Bath, Maine on February 16, 2014
I am considering a direct vent fireplace. I will be using propane fuel. I have a small alcove where there used to be cabinets. Since there is a pipe that we did not want to remove, we boxed it in and created an equivalent box on the other side for symmetry. Now I have a small alcove, 14 inches deep and 47.5 inches wide. It is 9 foot high.
I'm not sure of the size of fireplace to install. The area is approximately 275 square feet, semi open, having removed a doorway to the kitchen and taken the opening all the way up to the ceiling.
By Collin C. - NFI Master Hearth Professional on February 17, 2014
Answer:I appreciate the detailed information. While you have plenty of width to accommodate both a 36 and 42 inch model, the 14 inch depth is a bit of a problem. Most of our models require a depth of 15 inches or greater to fit, with only the vent free models being shallow enough. Do you have any variance on the depth or is that not adjustable? Please advise at your convenience.
By Anna from San Marcos, CA on January 8, 2013
I have a fireplace with a "starter" gas line, but think I need to get some kind of kit so that I can have an actual gas fire with the stone logs. I had that at our old house. I would just turn the gas on to have a fire. Now, I think the gas I do have can only "start" up wood logs and cannot be used for a "fire"? I think this is what a "handyman" once told us.
By Collin C. - NFI Master Hearth Professional on January 8, 2013
A log lighter is indeed designed to light up wood logs only and is not intended to serve as a gas log burner. Ideally, you would purchase a complete log set as an assembly. Examples can be seen here
. As you can tell, we have many styles to choose from, but feel free to ask any questions about a certain set or valve type.
By Cecilia from St. Cloud, MN on February 28, 2014
When the pilot light goes out, does the gas stop or leak into the house?
By Collin C. - NFI Master Hearth Professional on February 28, 2014
Answer:Gas valves in hearth appliances are configured so that a small electromagnet holds the pilot plunger open in the valve. If the pilot blows out, the magnet discharges and the plunger closes, ceasing the flow of gas.
By Ty from Philadelphia on October 26, 2013
Is it possible to turn a vent less gas fireplace into a vented gas fireplace? If so, how is this done?
By Collin C. - NFI Master Hearth Professional on October 28, 2013
Answer:If you are referring to a manufactured vent free fireplace, the answer is no. These units are built and listed as a vent free unit only and modifying them with a vent can result in dangerous operation.
If you have a vent free log set installed into a properly functioning masonry fireplace, you can crack the damper open just a bit to cut down on heat production.