Dryer Vent Installation & Replacement in Pinecrest
A new laundry location, a vent that dumps into the attic, or a run that has been vinyl hose since the house was built: we install and replace dryer vents in metal duct, routed as short and straight as the house allows.
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Some dryer vents cannot be saved by cleaning or patching. The duct is white vinyl or foil accordion hose snaked through a ceiling. The run ends under the eaves, blowing lint into a ventilated soffit, or it was never taken outside at all. The laundry moved during a remodel and the old path no longer lines up. Or the route is so long, with so many turns, that it clogs again soon after every cleaning. In each case the answer is a new run: 4-inch metal duct with a smooth interior, laid out for the fewest turns the framing allows, ending outside the house at a hood or roof cap with a backdraft damper.
FBC-R 2023 Section M1502 sets most of the rules, and they are worth knowing before anyone cuts a hole. The duct has to be metal at least 0.0157 inch thick (28 gauge), joined without screws, and supported at intervals no greater than 12 feet. The run is limited to 35 feet from the transition connection to the outlet, less a set allowance for each elbow, unless the dryer maker's instructions or the instructions for a UL 705 booster fan allow more. Where those instructions give no location, the outlet has to sit at least 3 feet from openings into the house, including ventilated soffits. We lay the route out against those limits, put the plan and its price in a free written estimate, and test the finished run with the dryer running.
What's Included
Rigid metal duct runs
New runs use smooth-wall metal duct, 4 inches in diameter, with a minimum thickness of 0.0157 inch, the material the dryer exhaust section of the code calls for. Vinyl, foil and PVC come out.
Rerouting and shortening
Long, twisting runs are rerouted for fewer turns and a shorter path, using long-radius elbows where the framing allows, since they count for less of the 35-foot limit than tight mitered ones.
Wall and roof terminations
New hoods and roof caps come with a backdraft damper and no screen, placed at least 3 feet from windows, doors and ventilated soffits unless the dryer maker specifies otherwise.
Transition hose and connection
The dryer is connected with a single listed transition duct no longer than 8 feet, kept out of walls and ceilings as the code requires, and set so it does not kink when the machine goes back.
Signs You Need It
- Your dryer is connected with white vinyl or foil accordion hose anywhere in the run.
- The vent ends in the attic, the garage, a soffit or a crawl space instead of outside.
- Drying slows down again not long after each cleaning, because the run is long or full of turns.
- You are moving the laundry, adding a dryer, or remodeling the room where it sits.
How It Works
Plan the route
We measure the path from the dryer location to the best exit, count the elbows against the 35-foot limit, and check what the dryer's installation manual allows.
Price it in writing
The route, the materials and the termination go into a free written estimate with upfront pricing before we cut into a wall, ceiling or roof.
Install and test
The duct goes in with joints lapped in the direction of airflow and sealed without screws, the hood or cap goes on, and the dryer runs while we confirm airflow at the outlet.
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Frequently Asked Questions
How long can a dryer vent be?
Under FBC-R 2023 Section M1502 the maximum is 35 feet, measured from the connection to the transition duct out to the outlet. Each elbow reduces that: a 4-inch-radius mitered 90-degree elbow counts as 5 feet, a mitered 45 as 2 feet 6 inches, and smooth long-radius elbows count for less. A longer run is allowed only where the dryer manufacturer's instructions permit it or a booster fan that conforms to UL 705 is installed, and it then needs a permanent label stating its equivalent length.
Is PVC pipe allowed for a dryer vent in Florida?
No. The Florida Building Code requires the exhaust duct to be constructed of metal, so PVC and other plastic pipe do not meet it. The connector running from the dryer to the wall has its own rule: it must be listed to UL 2158A, and the CPSC advises replacing plastic or foil accordion hose with rigid or semi-rigid metal duct.
Can a dryer be vented through the roof?
Yes, as long as the duct terminates outside the building and meets the length and material rules. Roof terminations make sense when the dryer sits upstairs or in an interior closet. The cap has to suit dryer exhaust, with a backdraft damper and no screen, and the duct cannot simply end in the attic, a soffit or a ridge vent and leave the roof to handle the rest.
How do you connect a dryer vent hose?
Start with one piece of metal transition duct that carries a UL 2158A listing and is 8 feet or shorter. Slide one end over the exhaust outlet on the dryer and the other over the duct collar at the wall, and secure both with clamps. Then ease the dryer back while someone watches the hose, so it curves instead of folding flat. If the dryer cannot sit back without crushing the hose, the wall connection needs to move or be recessed, and that is installation work.
Related Services
Working out whether a run is too long
The length limit is the rule that most often decides a new route. FBC-R 2023 Section M1502 allows 35 feet of exhaust duct, measured from the point where the transition hose connects to the outlet at the wall or roof. The hose itself does not count toward that figure. Every change in direction does: Table M1502.4.5.1 charges 5 feet for a mitered 90-degree elbow with a 4-inch radius and 2 feet 6 inches for the same elbow at 45 degrees, while a smooth 90 with a 6-inch radius costs 1 foot 9 inches.
In practice, a run with four tight 90-degree turns has spent 20 feet of its allowance before any straight duct is counted. Long-radius elbows buy some of that back, and so does moving the outlet to a closer wall. Where a longer run cannot be avoided, the code accepts the length in the dryer manufacturer's installation instructions, with a copy for that make and model handed to the inspector at the concealment inspection, or in the instructions for a booster fan that conforms to UL 705. Anything over 35 feet equivalent needs a permanent label within 6 feet of the exhaust duct connection.
Materials the code allows, and the ones it does not
The duct inside walls, ceilings and attics must be metal with a smooth interior, 4 inches in nominal diameter, with a wall no thinner than 0.0157 inch, which is 28 gauge. That excludes the white vinyl hose and foil accordion duct still found in many laundries, and it excludes PVC pipe as well. Where the duct passes close to framing and a nail or screw could go through it, steel shield plates at least 0.062 inch thick are required to protect it.
Between the dryer and the wall, the short connector follows separate rules. It must be a single length, listed to UL 2158A, no longer than 8 feet, and it cannot be hidden inside a wall or ceiling. For that piece the CPSC recommends rigid or corrugated semi-rigid metal and says to replace plastic or foil accordion hose, noting that most dryer manufacturers specify metal too. The NFPA puts it more briefly: rigid or flexible metal venting should be used.
Choosing where the vent leaves the house
A dryer vent has to end outside the building. It cannot stop in the attic, blow into a soffit or ridge vent, or discharge into a crawl space, and under the Florida Building Code, Mechanical, it can never be tied into a chimney, a gas vent or another duct. If the dryer's instructions are silent on location, keep the outlet 3 feet or more in any direction from openings into the house, and that includes the vents in a ventilated soffit.
Within those rules, the choice is usually between a wall and the roof. A wall termination is the easiest to reach for cleaning and repair, and it suits a laundry on an outside wall or in the garage. A roof termination makes sense for an upstairs or interior laundry, where a wall route would add too many feet and turns. When a single-story home has its laundry in the middle of the house, we compare both routes by equivalent length before recommending one.
When a dryer does not need a vent at all
Every conventional dryer, electric or gas, needs its duct. The dryer heats air, passes it through the clothes, and pushes the moisture-laden result outside. A gas dryer adds combustion products to that air, and the Florida Building Code, Mechanical requires both the moisture and the products of combustion to leave the building. The NFPA also advises having a qualified professional check a gas dryer's gas line and connection for leaks. If you ever smell gas in the laundry, get everyone out of the house and phone the gas utility or 911 once you are outside.
Listed condensing and heat-pump dryers are the exception. They work as a closed loop, pulling the water out of the air and draining it or collecting it in a tank, and FBC-R 2023 Section M1502.2, the rule that sends dryer exhaust outdoors, does not apply to listed and labeled condensing (ductless) clothes dryers. For an interior condo laundry with no reasonable route outside, one of these can be the practical answer. The tradeoff is a drain connection or a tank to empty, so check the model's installation requirements before choosing one.
Part of our Dryer Vent Cleaning work in Pinecrest and across south Miami-Dade County.