Direct vent gas fireplaces are sold on the idea that they can go almost anywhere, and that is true. What the brochure leaves out is that the venting is a separate bill, and it moves a lot depending on which wall or roof the pipe leaves through. This guide prices the four most common direct vent installs using real parts from our Ventis Direct Vent range, explains what pushes the cost up, and covers what to expect on labor.
If you are still working out which type of pipe your appliance needs, start with our guide to which venting your stove actually needs. Pellet stove owners have their own numbers in how much pellet stove venting costs.
The short answer
- Rear-vent appliance straight out the wall: about $690 in parts
- Top-vent appliance with a short rise, then out the wall: about $980 in parts
- Up through the ceiling and roof, single story: about $1,340 in parts
- Up through two floors with an offset: about $1,920 in parts
- Labor: a few hundred dollars for a wall exit, more for a roof penetration or a chase
All parts prices below are our current prices for 4-inch Ventis Direct Vent as of October 2026, in the galvanized finish except where only black is made. Every install is different, so treat these as worked examples, not quotes. Your fireplace's installation manual has the final say on what the run must include and which vent brands it is approved for.
A note on sizes before you price anything
Direct vent is a pipe inside a pipe. The inner pipe carries exhaust out and the gap between the two walls brings combustion air in. On our product pages the size is given as a single figure, so "4-inch" means a 4-inch inner pipe with a 6-5/8-inch outer wall. Appliance manuals usually write the same pipe as "4 x 6-5/8." Most residential gas fireplaces, inserts and stoves use this size. Larger units use 5 x 8, which we also stock, and the 5-inch parts run roughly 5 to 15 percent more than the 4-inch prices below.
Two things the appliance decides for you: the pipe diameter, and the list of vent brands it was tested with. Check that list in the manual before ordering any system, because a vent that is not on it can void the appliance listing and the warranty.
Install 1: rear-vent appliance straight out the wall (about $685)
The cheapest direct vent run is a rear-vent fireplace or stove sitting against an exterior wall. The pipe leaves the back of the appliance, passes straight through the wall and ends in a horizontal cap outside. There is no rise, no elbow and no roof work. It only works where the manual allows a horizontal termination straight off the appliance, and where the cap outside can meet the clearances from windows, doors, soffits, decks and the ground.
- 12-inch pipe section (VDV-0412): $99
- Wall pass-thru (VDV-WPT04): $145
- Horizontal termination cap (VDV-HC04): $441
Total: $685. The cap is the expensive part of every horizontal install, and it is not the place to economize. It is the component that keeps exhaust and intake air separated in wind, and it is what the appliance was tested with. A thicker wall needs a longer pipe section, which adds $10 to $50.
If you would rather buy the wall exit as a set, the horizontal installation kit (VDV-KW04) bundles the pass-thru, cap and connecting pieces for $956. It costs more than the three parts above because it includes the pipe and fittings for a short rise as well.
Install 2: top-vent appliance with a rise, then out the wall (about $980)
Most direct vent fireplaces vent from the top, and most manuals require a minimum vertical rise before the pipe turns horizontal. The rise builds draft and keeps the flame pattern right. The common layout is a short vertical section off the top of the firebox, a 90-degree elbow, a horizontal section through the wall and a cap outside. The manual gives a chart of allowed rise-to-run combinations; a longer horizontal run usually needs a taller rise.
- 36-inch pipe for the rise (VDV-0436): $152
- 90-degree elbow (VDV-EL0490): $143
- 12-inch pipe through the wall (VDV-0412): $99
- Wall pass-thru (VDV-WPT04): $145
- Horizontal termination cap (VDV-HC04): $441
Total: $980. Where the pipe will be seen above the fireplace, swap the galvanized rise for the black 36-inch section (VDVB-0436) at $230 and the black elbow (VDVB-EL0490) at $155, which adds about $90. Inside a framed chase, galvanized is fine.
Install 3: up through the ceiling and roof, single story (about $1,340)
A vertical run through the roof is the usual choice when the fireplace sits on an interior wall, or when the outside wall cannot take a cap because of windows or a deck. It costs more than a wall exit because it needs more pipe, a firestop at the ceiling, a shield in the attic and a flashed penetration through the roof. This example assumes about 11 feet of pipe from the top of the appliance to the cap on a single-story home.
- 2 x 48-inch pipe (VDV-0448): $364
- 36-inch pipe (VDV-0436): $152
- Ceiling firestop (VDV-FS04): $152
- Attic insulation shield (VDV-AIS04): $234
- Roof flashing, 0/12 to 6/12 pitch (VDV-F0406): $130
- Storm collar (VDV-SC04): $33
- Vertical termination cap (VDV-VC04): $276
Total: $1,341. A steeper roof needs the 7/12 to 12/12 flashing (VDV-F0412) at $178 instead, and a flat roof takes the flat roof flashing (VDV-F04F) at $157. In a windy or coastal location, the high-wind cap (VDV-VCH04) at $176 is the better termination and is actually cheaper than the standard one.
Install 4: through two floors with an offset (about $1,920)
A two-story run is the single-story install with more pipe, a second firestop where the vent passes the upper floor, and often a pair of 45-degree elbows to step the pipe sideways around a joist, a beam or a wall on the floor above. Offsets are where direct vent runs get expensive and where the manual's limits matter most, because every elbow reduces the total height the system is allowed to reach.
- Everything in Install 3: $1,341
- Extra 48-inch pipe (VDV-0448): $182
- Second firestop for the upper floor (VDV-FS04): $152
- 2 x 45-degree elbows for the offset (VDV-EL0445): $246
Total: $1,921. Taller homes add roughly $45 per foot of pipe. If the run passes through a framed chase, the square ceiling support (VDV-CSS04) at $441 carries the weight of the stack instead of the appliance collar; check whether your manual calls for one above a certain height.
What pushes the cost up
- The termination cap. At $276 to $441 it is the biggest single line on every list, and horizontal caps cost more than vertical ones.
- Elbows and offsets. Each 45 or 90 costs $123 to $175 and reduces the allowed run, which can force a different route.
- Roof penetrations. Flashing, storm collar, attic shield and the labor to seal them add $400 or more over a wall exit.
- Black pipe. The painted finish adds $25 to $80 per section, so use it only where the pipe is visible.
- The 5-inch system. Larger fireplaces that need 5 x 8 pipe pay roughly 5 to 15 percent more per part.
- Masonry chimneys. Putting a direct vent insert into an existing fireplace means a co-linear system: the masonry conversion kit (VDV-MCK04) at $402, the co-linear top termination (VDV-CTT04) at $264, plus two flexible liners run up the flue, which are priced by the foot. Budget $1,000 to $1,500 in parts for a typical chimney, and have it inspected first.
What labor costs
Installer rates vary by region, but a straightforward wall exit on a ground-floor fireplace is typically a half-day job, in the low hundreds of dollars on top of the parts. A vertical run through a roof is a full day for a two-person crew because of the roof work, the attic shield and the firestops, so expect several hundred to around a thousand dollars. Chase construction, second-story offsets and masonry conversions sit at the top of the range.
Direct vent appliances also need the gas line, and in most areas a permit and inspection. When you compare quotes, check whether they include the venting parts, the gas connection, the permit and the first start-up, because some quotes are labor-only. Running the pipe is within reach of a capable DIYer; the gas connection usually is not, and in many places it must be done by a licensed fitter.
How to keep the cost down
- Put the fireplace on an exterior wall if a horizontal termination is allowed; it saves the whole roof penetration
- Plan the shortest route with the fewest elbows the manual permits
- Use black pipe only where it will be seen
- Check the manual's approved vent list before buying anything, so nothing has to be returned
- Buy the whole run in one order so every part comes from the same Ventis system
- Have the run checked against the manual before any holes are cut
REMEMBER
Your local authority having jurisdiction may enforce building codes that differ from the manufacturer's instructions. Confirm the requirements in your area, follow your appliance's installation manual for clearances, termination locations and the approved vent brands, and use a qualified installer for any work you are not comfortable doing yourself.
If you send us your fireplace model and a sketch or photos of where the vent needs to go, we will put together the parts list and check it against the manual before you order. Browse the full range of direct vent pipe and components.
By Matthew Murphy
