A direct vent gas fireplace is the unit we recommend most often, and in New York City it is usually the only gas fireplace you can legally install. It burns behind sealed glass, pulls combustion air from outside, and sends exhaust out through a wall or roof. No chimney, no open flame in the room. This guide covers venting, sizing, framing, glass safety, controls, fuel, local rules, and what owners tell us after a few winters. Browse our direct vent gas fireplaces as you read.
The short answer
Size the unit to the room (roughly 4 to 5 BTU per cubic foot), confirm a legal vent path through a wall or roof within the manufacturer's run limits, choose electronic ignition with a blower and remote, and in NYC line up a licensed master plumber and board approval before you order. For most living rooms that means a 36 to 42 inch traditional box or a 42 to 60 inch linear.
Key takeaways
- Direct vent is the only gas fireplace type you can legally install in New York City without a chimney. Vent-free is prohibited by the NYC Fuel Gas Code.
- The vent path decides the model. Confirm a wall or roof termination within the manual's run limits before you fall in love with a unit.
- Size by heat, not just width: about 4 to 5 BTU per cubic foot of room, then favor a unit with a wide turndown range over a bigger burner.
- Traditional boxes give the most heat per dollar; linears give the modern look but less heat per inch and need non-combustible facing.
- Order electronic ignition with battery backup, a variable speed blower and a thermostatic remote. Those three upgrades are what owners thank us for later.
- Budget for the vent kit, front, liner and media. Most units ship as a bare box, and in NYC the gas hookup must be done by a licensed master plumber.
In this guide
- How does a direct vent fireplace work?
- Should I vent through the wall or the roof?
- What size and BTU rating do I need?
- Linear or traditional?
- What framing and clearances are required?
- How hot does the glass get, and is the screen required?
- Which ignition, blower and remote should I get?
- Natural gas or propane?
- What are the NYC rules?
- What do owners say after a few winters?
- Our recommended models
- Which should you choose?
- Frequently asked questions
How does a direct vent fireplace work?
Direct vent means sealed combustion. The firebox is closed off from the room by a fixed glass panel. A coaxial vent (one pipe inside another) connects the box to the outdoors: the inner pipe carries exhaust out, and the space between the inner and outer pipe draws fresh air in for the burner. Nothing from the fire enters the room, and the fire never pulls heated room air up a flue the way an open masonry fireplace does.
That sealed design is why direct vent units get real heating credit. Manufacturers publish steady-state efficiencies in the 65 to 75 percent range for traditional models; Kozy Heat's Bayport 36 lists 71 percent on natural gas. Heat comes off the glass as radiant warmth and, with a blower, as warm air pushed out of a grille above or below the viewing area.
Compare the other two gas options. A vented gas log set in an open masonry fireplace looks great but sends most of its heat up the chimney. A vent-free unit keeps all its heat in the room along with its combustion byproducts, which is why it is prohibited in New York City. A direct vent box sits between the two: good heat, clean indoor air, no chimney needed.
Should I vent through the wall or the roof?
Where the vent goes decides what you can buy and where it can sit. Every direct vent fireplace ships with a vent table in its manual that spells out the allowed combinations of vertical rise and horizontal run.
- Horizontal (through the wall) is the simplest install. The unit sits on an exterior wall, the pipe rises a short distance and runs out, and a cap goes on the outside of the house. Most manuals want some vertical rise before the horizontal leg and cap the horizontal run.
- Vertical (through the roof) lets you put the fireplace on an interior wall or in a multi-story building. Vertical runs can go much farther, but every elbow eats into the allowance.
As a concrete example, the installation manual for Napoleon's Altitude X 36 limits total vent length to 40 feet and the horizontal portion to 20 feet, with longer runs needing a power vent. It also requires the first two feet of pipe off the appliance to be wrapped in a one-inch insulation sleeve. Your model's numbers will differ, which is why we ask for a photo of the wall and a rough floor plan before quoting a vent kit.
Pipe is brand-specific. Napoleon's Ascent series uses a 4 inch inner by 7 inch outer coaxial pipe; the Altitude X calls for an 8 inch outer pipe; Majestic requires its own DVP system. You cannot mix brands, and the vent kit is almost always sold separately from the fireplace.
Termination caps have clearance rules from the manufacturer and the NYC Fuel Gas Code: distance from operable windows, doors, the gas meter, soffits, grade and the lot line. On a Queens or Brooklyn row house with a narrow side yard, those clearances often decide between a wall and a roof termination before anything else does.
From our install team
Keep the run short with as few elbows as possible. A long horizontal leg is the most common reason a fireplace sooted or lit poorly on a service call. Power vents solve tricky runs, but they add cost, noise and a part that can fail.
What size and BTU rating do I need?
Two sizes matter: the physical width (the 36 or 42 in the model name) and the heat input in BTU per hour. A 36 inch traditional box might run 18,000 to 26,500 BTU; a 36 inch linear with a glass bed is often lower because the burner is tuned for the flame picture rather than output.
For heat, Regency's rule of thumb is a good start: multiply the room's volume in cubic feet by 4 for a mild climate or 5 for a cold one. A 20 by 15 foot room with 8 foot ceilings in a cold climate works out to about 12,000 BTU to hold temperature. Add a cushion for single-pane windows, drafty brownstone floors or an open plan. Heatilator's charts put a 14,000 to 20,000 BTU unit at 400 to 700 square feet and a 19,500 to 27,500 BTU unit at 700 to 1,100 square feet, which matches what we see.
| Space | Typical input | Typical unit |
|---|---|---|
| Bedroom, den, small apartment living room | 14,000 to 22,000 BTU | 30 to 36 inch traditional, e.g. Napoleon Ascent 30 or Superior DRT2035 |
| Standard living room, 300 to 600 sq ft | 22,000 to 30,000 BTU | 36 inch traditional or 42 inch linear, e.g. Kozy Heat Bayport 36 or Napoleon Ascent Linear 42 |
| Great room, open plan, 600 sq ft and up | 30,000 to 45,000 BTU | 42 inch traditional or 48 to 72 inch linear, e.g. Majestic Marquis II or Montigo Distinction 48 |
Do not oversize. A fireplace that is too strong for a small apartment room gets shut off after twenty minutes. Look for a wide turndown range instead: the Marquis II 36 modulates from about 25,000 to 44,000 BTU on natural gas, which lets you run it low on a mild night and high on a January one.
Linear or traditional?
Traditional units are roughly square, hold a log set, and read as a classic fireplace. They have the best heat per dollar, more interior options (brick panels, reflective black glass, different log species), and they suit a mantel. The Napoleon Ascent 36, Kingsman HBZDV3628 and Kozy Heat Bayport 41 are all in this family.
Linear units are wide and short, usually 36 to 72 inches, with a ribbon of flame over glass media, stones or driftwood. They are built for a clean wall of tile, stone or plaster, often with a TV above. Expect less heat per inch of width and a requirement for non-combustible facing around the opening. See the Napoleon Ascent Linear Premium 46, Kozy Heat Slayton 60, Majestic Echelon II 72 and Superior DRL6000 84 for the range of sizes.
A third category: see-through and multi-sided units that divide two rooms. The Napoleon Tall Vector 50 and Montigo Distinction 48 see-through are the ones we spec most. Plan the vent early, since the box is deeper and usually sits in a partition wall.
What framing and clearances are required?
A direct vent fireplace is a zero-clearance appliance. The shell can be framed with ordinary wood studs to the dimensions in the manual, usually a half inch or so bigger than the box. The Ascent 36 is 34.5 inches wide, 33.4 tall and 15.75 deep, with a rough opening of 34.75 by 33.5 by 16 inches. Shallow boxes like that fit in a wall bump-out in a Manhattan apartment where a masonry fireplace never could.
Where people get into trouble is the finishing. Three rules show up in nearly every manual:
- Non-combustible facing around the opening. Tile, stone, metal or cement board, not drywall or wood, for a specified band around the glass. Manuals also limit projection. Napoleon's Altitude X allows facing to stick out no more than 4 inches from the door face; beyond that, clearances grow by 2 inches for every extra inch.
- Mantel clearance. The deeper a combustible mantel, the higher it has to sit above the opening. If you want a chunky wood beam low over a linear unit, plan on a non-combustible mantel shelf or a heat deflector.
- TV above the fireplace. Units marketed as TV-ready rely on a heat management kit that ducts warm air away from the wall above, or a power vent. Without it, the wall above a 30,000 BTU unit gets hot enough to shorten the life of a TV.
Also budget for trim. Most units ship as a bare box: the front, surround, interior panels and media are separate line items. A Kingsman ZCV39 or Napoleon Ascent X 42 can look like four different fireplaces depending on which front and liner you pick.
Not sure what fits your space? Send us a photo of the wall, the ceiling height and where the nearest exterior wall or roof is, and we will tell you which units vent cleanly from that spot. Book a free design consultation and we will help you narrow it down.
How hot does the glass get, and is the screen required?
The glass gets hot. Hot enough that since January 1, 2015, the ANSI Z21.88 / CSA 2.33 standard has required a protective barrier on any vented gas fireplace whose glass exceeds 172 degrees Fahrenheit in testing. The barrier ships with the unit and must be in place at installation. In practice it is a fine black mesh that sits an inch or so in front of the glass, nearly invisible once the fire is lit, and most brands now offer decorative fronts that double as the barrier.
If you have young kids, a dog that leans on things, or an older relative, do not remove the barrier for looks. We get asked. The answer is no.
Glass type matters too. Ceramic glass (used on the Bayport, Ruby and most heater-rated units) transmits radiant heat and tolerates high burner temperatures. Tempered glass shows up on some value units and large linears where the view comes first. Both are safe with the barrier; ceramic usually means more warmth on your shins.
Which ignition, blower and remote should I get?
Standing pilot (millivolt). A small pilot burns all the time and generates its own electricity, so the fireplace lights from a wall switch even in a blackout. Forum owners like it for simplicity and for keeping cold drafts out of the firebox; they dislike paying to run a pilot all summer. Napoleon's Ascent, Superior's DRT2035 and Kingsman's IDV inserts all come in millivolt.
Intermittent pilot ignition (IPI, electronic). The pilot lights only when you call for fire. More efficient, better remotes, and it is what Majestic's IntelliFire Touch, Napoleon's Proflame II and Kozy Heat's electronic models use. The tradeoff is dependence on power, but nearly every current IPI unit ships with a battery backup for the valve. Our default recommendation is electronic ignition with battery backup.
Blower. A fan pushes warm air out of the firebox into the room. It adds real heating performance and is the single most common upgrade we add. It also adds noise: owners describe a quiet hum on low and a noticeable fan on high, so get variable speed. Kozy Heat includes the fan on log models of the Bayport; on many Napoleon and Superior units it is an add-on.
Remotes and controls. At minimum, get on/off with flame height. Thermostatic remotes hold a room temperature. Majestic's RC400 touchscreen mounts on the wall as a thermostat, and the IntelliFire app adds phone and voice control; Napoleon's eFire does the same for Proflame II units. Browse remotes and controls, and make sure the remote matches the valve in your fireplace. They are not universal.
Natural gas or propane?
If the building has a gas line, natural gas is the answer: lower cost per BTU, no tank, no deliveries. Units are ordered for one fuel from the factory, and many can be field-converted with a kit. Napoleon also sells dedicated propane versions of several models, such as the Elevation X 36 propane and Elevation X 42 propane.
Propane's rated input is usually a little different from the natural gas figure (the Marquis II lists 44,000 BTU on natural gas and 43,500 on propane). Propane is heavier than air, so manuals are stricter about low terminations, and the FDNY restricts propane storage inside the five boroughs. On Long Island's North Shore, in Westchester and in parts of New Jersey without gas service, propane is routine. In New York City we treat it as the exception and confirm the rules for your building before ordering an LP unit.
What are the NYC rules?
Four local facts shape every fireplace job inside the five boroughs.
Vent-free is out. The New York City Fuel Gas Code does not permit unvented gas room heaters or vent-free fireplaces. We sell vent-free products for New Jersey, upstate and elsewhere, and we will not install one in New York City. Direct vent is the legal path for a gas fireplace in an NYC home without a chimney.
No new wood burning since 2016. Local Law 38 of 2015 added Section 24-149.2 to the Administrative Code, effective May 6, 2016: no new fireplace may be operated unless it runs solely on natural gas or a renewable fuel. Existing wood fireplaces were grandfathered. That is a big reason direct vent units show up in nearly every new condo tower and brownstone renovation.
Gas work needs a licensed master plumber. Under the NYC Fuel Gas Code, gas work must be done under the direct and continuing supervision of a DOB-licensed master plumber, and since January 1, 2020 anyone doing the work must hold a Master Plumber License or a Gas Work Qualification. Connecting a fireplace is gas work. Our crews handle the fireplace, venting and finishing; the gas connection is done by a licensed master plumber with the proper permit.
Co-op and condo boards. Expect an alteration agreement, an engineer or architect letter, insurance certificates, and often facade approval for the exterior cap. A wall cap on a landmarked block may need Landmarks Preservation Commission sign-off. Start the board conversation early; the vent route is what boards push back on, not the fireplace.
From our install team
Boards want the installation manual, the vent termination drawing with clearances marked, and the ANSI Z21.88 listing. We include all three with the quote. Having them on the first submission saves weeks.
What do owners say after a few winters?
We read a lot of owner reviews and forum threads, and we hear the same themes in our service department. None are reasons not to buy; they are things to know going in.
- The blower is louder than expected on high. Owners settle at low or medium and call it fine. If silence matters, pick a heater-rated unit with ceramic glass so you can leave the fan off.
- A white haze forms on the glass. Normal, most noticeable in the first year or two, and it wipes off with a cleaner made for fireplace glass. Left for several seasons it can etch permanently.
- Standing pilot vs. electronic is a real debate. Millivolt owners like that it always lights with nothing electronic to fail. IPI owners like app control and the lower gas bill. Both are right.
- Heat is better than people assumed. The common positive surprise is how much a 25,000 to 30,000 BTU unit heats a living room. The common disappointment is a big linear bought for looks that makes less heat than a smaller traditional box.
- BTU numbers from different dealers do not match. Input and output are different figures, and some sellers list the max while others list the range. Compare input to input and ask for the manual.
Our recommended models
These are the direct vent units we quote most often, picked for how they vent, how they heat and how they hold up on service calls. Traditional boxes first, then linears.
Traditional boxes
Linear and architectural
Also worth a look: the Ascent Linear Premium 42 for a modern apartment wall, and the slim SÓLAS FORTY8 when the architect has drawn a feature wall. If you already have a masonry fireplace, read about gas inserts instead.
Direct Vent Gas FireplacesAll Gas FireplacesSee-Through FireplacesRemotes & ControlsFireplace Mantels
Which should you choose?
Choose a traditional box if:
- Heat matters as much as looks. You get the most BTU per dollar and ceramic glass on heater-rated models.
- You want a mantel, a log set and a fireplace that reads classic in a brownstone or colonial.
- The budget is tight. Fronts, liners and vent kits for a 36 inch box cost less than for a 60 inch linear.
Choose a linear if:
- The wall is modern: tile, stone or plaster floor to ceiling, often with a TV above.
- You are willing to pay for a heat management kit or accept less heat per inch of width.
- You have a great room where 48 to 72 inches of flame fits the scale.
Choose a see-through if:
- The fireplace divides two rooms or an indoor and outdoor space.
- You can plan the vent run early, since the deeper box usually lives in a partition wall.
For most NYC and Long Island living rooms we recommend a 36 inch traditional box with electronic ignition, a variable speed blower and a thermostatic remote: the Napoleon Ascent 36 for value, the Kozy Heat Bayport 36 for heat, the Majestic Marquis II when you want the premium view. Go linear only when the wall design calls for it, and pair it with heat management if a TV is going above. Either way, confirm the vent route before you order the unit.
Frequently asked questions
Can I install a direct vent gas fireplace in a NYC apartment with no chimney?
Yes, that is what direct vent is for. It vents through an exterior wall or the roof with its own sealed pipe. You need a vent path within the manufacturer's limits, co-op or condo board approval, and a licensed master plumber for the gas connection.
Is a vent-free gas fireplace legal in New York City?
No. The NYC Fuel Gas Code does not allow unvented gas room heaters or vent-free fireplaces. Direct vent is the legal gas option in the five boroughs. Vent-free is legal in much of New Jersey, Long Island and upstate, and we sell it for those areas.
How many BTUs do I need for my living room?
Multiply the room's cubic feet by 4 for a mild climate or 5 for a cold one. A 20 by 15 foot room with 8 foot ceilings in the Northeast needs about 12,000 BTU to hold temperature, so a 20,000 to 30,000 BTU unit with good turndown gives quick warm-up plus the ability to run low.
How far can a direct vent fireplace be vented?
It depends on the model. Napoleon's Altitude X 36 manual, for example, allows 40 feet of total vent with no more than 20 feet horizontal; longer runs need a power vent. Every elbow reduces the allowance. Check the vent table in the manual, or send us your layout.
Does a gas fireplace need electricity to work?
A millivolt (standing pilot) unit runs with no electricity. An electronic ignition unit needs power to light, but nearly all current models include a battery backup for the valve. The blower and accent lighting always need power.
Why is there a white film on my gas fireplace glass?
A white haze is normal, especially in the first year or two. It comes from combustion byproducts condensing on cool glass. Clean it once or twice a season with a cleaner made for gas fireplace glass. Left for years it can etch the glass permanently.
Is the mesh safety screen required?
Yes. Since January 1, 2015 the ANSI Z21.88 standard has required a protective barrier on vented gas fireplaces whose glass exceeds 172 degrees Fahrenheit in testing, which is nearly all of them. Decorative fronts that double as the barrier are available for most models.
Talk to a specialist
Let us vent-check your wall before you buy
We have been designing, selling, installing and servicing fire features and outdoor kitchens for over 30 years across New York City, Long Island, Westchester, New Jersey and South Florida. Send us a photo and a floor plan and we will tell you which direct vent units fit, how they vent, and what your board will want to see.
Book a free consultationCall 718-326-4328Showroom: 58-30 Maspeth Ave, Maspeth, Queens.
Related guides
Browse all buying guides and expert advice →
Written by the NYC Fireplaces & Outdoor Kitchens team. Last reviewed October 2026. We sell, install and service the products discussed here.
Sources:Napoleon Ascent 36 product page, Napoleon: How Direct Vent Fireplaces Work, Kozy Heat Bayport 36 specifications, Superior DRT2000 series, Regency sizing guidance, Heatilator BTU guidance, HPBA on ANSI Z21.88 glass barriers, NYC Administrative Code 24-149.2 (Local Law 38 of 2015), NYC DOB gas work service notice, 2022 New York City Fuel Gas Code. Specifications change; always confirm with the manufacturer's current installation manual.