Dryer Vent Installation for a New or Relocated Dryer

A dryer is a simple appliance with one demanding requirement: it has to push a large volume of hot, wet, lint-filled air all the way out of your building, every single load, for years. Everything else about a laundry room is negotiable. The vent route is not. It is the thing that decides whether a laundry location is a good idea or a permanent frustration.

We are Vent Pro NYC, a family-owned company installing and repairing dryer venting across Brooklyn, the rest of NYC, and Deal, NJ. We get called for installations in two very different situations, and it is worth separating them before anything else, because they are not the same job.

The two jobs

A new dryer going where a dryer already was. This is the common one. The machine changed; the building did not. There is an existing duct run, an existing termination, and an existing connection behind the machine. The work is mostly verification: does the run that served the old dryer actually serve this one, is it intact, is it clean, and is the connection correct and legal.

Do not assume the answer is yes. A new dryer is often deeper or taller than the one it replaced, which pushes the machine further out and crushes the hose behind it. New machines also tend to be more sensitive to restriction than old ones — modern moisture-sensing dryers extend cycles or throw a vent warning when airflow is poor, where a twenty-year-old machine would simply have run hot and said nothing. Plenty of people call us convinced their new dryer is defective when the actual problem is the fifteen-year-old duct behind it. That run is its own subject, covered in dryer vent duct repair and replacement.

Laundry moving to a room that has never had a dryer. A basement, a hall closet, a bathroom, a kitchen wall, an upper floor of a brownstone. This is a real installation: there is no duct, no termination, and no precedent, and every decision is open. The rest of this article is mostly about that case, because that is where the choices you make on paper determine whether the machine works.

Where the vent can terminate

We start at the outside of the building and work backward. This surprises people — they expect us to start at the dryer — but the termination is the constraint. If there is no acceptable place for the exhaust to leave the building near your proposed laundry location, the location is wrong, and no amount of clever ducting fixes that.

What we are looking for:

• An exterior wall within a short, direct reach of the machine. Nearly always the best outcome.
• Adequate clearance at the termination point. The exhaust has to discharge into open air, away from windows, doors, fresh-air intakes, and your neighbor's wall. On attached Brooklyn buildings this matters more than people expect, because the gap between two houses is not open air.
• A face of the building where a cap can be serviced. A termination you cannot reach is a termination nobody will ever clean.
• An existing penetration we can reuse. An abandoned vent, an old through-wall opening, a chase that already runs where we need to go. Reusing one is cleaner and cheaper than making a new one.

In an attached row house you have exactly two exterior faces, front and rear, and party walls on both sides. That single fact drives most Brooklyn laundry-location decisions, and it is why so many brownstone dryers end up venting to the roof.

Equivalent length, in plain English

Here is the idea that matters most, and it is not complicated once somebody says it plainly.

Your dryer's blower can only push air so far. The manufacturer publishes a maximum duct length, and code sets a ceiling as well — commonly 35 feet for residential work, with the manufacturer's number taking precedence when it is stricter.

But air does not only lose energy over distance. It loses energy every time it has to turn. So the rule counts turns as if they were distance. A 90-degree elbow is treated as roughly five feet of additional run. A 45-degree elbow is treated as roughly two and a half feet. Add the real footage to the elbow penalties and you get the equivalent length — the number that actually has to fit inside the limit.

Work an example. A route with 20 physical feet of duct sounds comfortable. Add four 90-degree elbows — which is easy to do when you leave the machine, turn into a wall, turn again at a joist, and turn once more to reach the cap — and you have added 20 feet of penalty. Equivalent length: 40 feet. That route is over the line, and it will behave like it: long cycles, lint packing at every turn, and a homeowner who assumes the dryer is the problem.

The maximum allowable exhaust duct length shall be 35 feet from the connection to the transition duct from the dryer to the outlet terminal. — IRC M1502.4

This is why we push so hard for the shortest practical route with the fewest turns, and why we will sometimes recommend a laundry location one room over from the one you had in mind. Two elbows saved is ten feet of headroom. The full code treatment is in our NYC building code guide, and the long-run case is in Brooklyn brownstone long vent runs.

Wall termination or a roof run

Given a choice, a wall termination wins almost every time. It is shorter, it has fewer turns, it is easier to inspect, it is easier to clean, and the cap is reachable. If your proposed laundry location sits on or near an exterior wall, that is the answer.

A roof run is what you use when there is no exterior wall in reach — an interior laundry closet on an upper floor, a rear extension with no usable face, a unit whose only exterior walls are shared or fully glazed. Roof runs work, and Brooklyn is full of them, but they cost you in three ways: they are long, they are usually vertical with turns at each end, and they need a proper roof jack with a working damper rather than an open pipe or a screened cap. They also collect more lint, so they need cleaning more often.

The one termination style we approach carefully is a soffit. A soffit vent that genuinely carries exhaust past the soffit and out is acceptable. A soffit vent that dumps into the soffit cavity — which is what we find more often than not — is venting your dryer into your own roof structure. We walked through all four termination types and the ways they go wrong in roof, wall, soffit and sidewall dryer vents.

Whatever style you end up with, the cap gets a spring-loaded damper and no mesh screen. Screens on a dryer termination are prohibited for a good reason: lint bridges the mesh and turns it into a solid disk within a season.

Locations that do not work

Some proposals we decline, and it is fairer to say so early than to install something that will disappoint you.

An interior closet with no exterior wall and no path to the roof. If the exhaust has nowhere to go, a vented dryer does not belong there. This is not a routing puzzle we can solve with more duct. The realistic alternatives are relocating the laundry, or a condenser or heat-pump dryer, which requires no exhaust duct at all — we compared those honestly in condenser and ventless heat-pump dryers.

A run that would have to cross most of the building. Technically possible, practically a bad trade. A very long horizontal run with multiple turns will underperform from day one and need frequent cleaning forever.

Terminating into a garage, a crawlspace, an attic, a basement, a soffit cavity, or any other enclosed space. Never. This is the one absolute in this article. Dryer exhaust is hot, extremely humid, and full of combustible lint. Discharged into an enclosed part of your building it produces exactly what you would expect: saturated insulation, rot, mold conditions, and a growing pile of lint in a space nobody inspects. It also violates code — exhaust must terminate outside the building. If you inherit a setup like this, treat it as urgent rather than cosmetic.

Indoor lint traps and water buckets. They are sold, they are cheap, and they do not work. They capture some lint and none of the moisture, which means you are humidifying your home with every load.

A termination in a shared airshaft or a light well, or directly at a neighbor's window. Even where it is physically possible, it creates a problem for somebody, and in a co-op or condo it will not survive board review.

The closet problem: makeup air

A dryer does not only push air out. It has to pull an equal volume in. Put a vented dryer in a small closet with a solid door and a good seal, and the machine ends up fighting a partial vacuum — it cannot draw the air it needs, so it exhausts poorly, dries slowly, and runs hot, even with a perfect duct run.

The fix is unglamorous and effective: give the closet a way to breathe. A louvered door, a transfer grille, or a proper undercut at the bottom of the door will do it. If you are building a laundry closet from scratch, plan this in rather than discovering it later. It is one of the most common reasons a technically correct installation still underperforms, and it costs almost nothing to get right at the framing stage.

Gas dryers in confined spaces have combustion-air requirements on top of this, which is another reason the next section exists.

Gas dryers and the gas line

If your new laundry location does not already have a gas line and you want a gas dryer, that line is not our work. Running, extending, or connecting gas piping in New York City requires a licensed master plumber, and depending on the building and the scope it may require filings and inspection. That is the law, it is the right law, and we are not going to work around it.

What we do is the venting. In practice the sequence is: you engage a licensed plumber for the gas work, we handle the exhaust duct and termination, and the two get coordinated so the machine is not sitting in the middle of your floor waiting for one of us. We are happy to talk directly with your plumber so the two systems do not collide inside the same wall.

One thing worth understanding about gas dryers: the exhaust duct carries combustion byproducts, not just moist air. That raises the stakes on every rule in this article — proper materials, sealed joints, and a genuine termination outdoors.

What has to be true before install day

Installations go smoothly when a few things are settled in advance. Before we arrive, we want:

• The machine location fixed, including which way the door swings and how far the dryer sits off the wall
• The route agreed, including where the exhaust terminates and whether it is a wall or roof run
• Electrical or gas handled by the appropriate trade — a dedicated circuit for an electric dryer, a licensed plumber's line for a gas one
• Access to the route, including the basement, the closet interior, the roof, or wherever the run passes
• Board or managing agent approval where required, plus our certificate of insurance on file, which we send as a matter of routine
• The area cleared — we need working room at both ends of the run

If you are mid-renovation, this is the moment to loop us in rather than after the walls close. Getting the duct path right while the framing is open costs a fraction of what it costs to correct later, and it avoids the whole category of problem we described in after a Brooklyn renovation.

What the finished install includes

When we hand a new installation back to you, it includes:

• A rigid metal duct run, correctly sized, routed for the shortest practical path with the fewest turns
• Joints sealed with rated foil tape and mechanically fastened where needed with fasteners that do not intrude into the airstream — no sheet-metal screws inside the duct
• A new exterior vent cover or roof jack with a working spring-loaded damper and no mesh screen
• A fireproof, NYC-approved metal transition hose between the wall and the machine, sized so it is not crushed when the dryer is pushed back — the hose-material rules are covered in flexible hose versus rigid metal duct
• An airflow reading at the machine once the run is live, so the installation is verified rather than assumed
• A written record of the route, the equivalent length, and the termination type, which is worth keeping for a board, a buyer, or the next technician
• Cleanup, and a firm price agreed in writing before any of it started

All of our work is guaranteed.

Frequently asked questions

I am replacing my dryer with a similar model. Do I need anything done?

Not necessarily, but it is the ideal moment to look. The duct is accessible exactly once — while the old machine is out — and that access disappears the second the new one goes in. A clean and an inspection at changeover costs far less than discovering a crushed run six months later.

Can you install a dryer vent in a bathroom or a kitchen?

Frequently, yes, if there is a workable exterior wall nearby and the layout allows a short run. Both rooms tend to have plumbing, cabinetry, and existing ductwork competing for the same wall cavities, so the route needs planning rather than improvising. Send us photos and we will tell you what looks possible.

How many elbows is too many?

There is no single number, because it depends on total distance and on your dryer's published limit. The working principle is that each 90-degree turn eats about five feet of your budget, so a route with four turns has spent twenty feet before any actual duct is counted. When we lay out a run, reducing elbow count is usually the single most valuable change available.

Do you install the dryer itself?

We install and connect the venting. Setting the machine, the electrical circuit, and any gas piping belong to the appliance installer, an electrician, and a licensed master plumber respectively. We coordinate with all of them, and we would rather sequence the work properly than have four trades in one closet on the same afternoon.

My co-op wants to know exactly what will be installed. Can you provide that?

Yes. For board submissions we document the proposed route, materials, termination type and location, and provide our certificate of insurance in advance. Boards generally approve much faster when the request arrives complete rather than in pieces.

Get a quote on your installation

Installations are quote-only because the route is the entire job, and no two Brooklyn buildings offer the same route. We look at the space, tell you honestly what is possible and what we would not recommend, and give you a firm written price before anything begins.

Vent Pro NYC is family-owned, licensed, insured, and has been planning dryer vent routes in Brooklyn buildings for over ten years — including the awkward ones. Send a photo of where the dryer is going to (718) 541-5567, or request an estimate and describe the space. We are available Sunday through Thursday 7am to 7pm and Friday until 3pm.