What You Need to Do Before Turning On a New Dryer
A dryer needs two connections before it will run: a vent duct that carries hot, wet air outside, and either a power cord (electric) or gas line (gas). Most people can make these connections themselves with basic tools in 30 to 45 minutes. The vent connection is the same for both types; the power or gas connection depends on which dryer you own.
Before you start, check your dryer's manual for the exact specifications—vent diameter, gas line size, and electrical requirements vary by model. If you are renting, contact your landlord before making any changes. If you are unsure about gas work, hire a licensed technician; gas leaks are dangerous and should never be a DIY project.
Key Takeaways
- The vent duct must run as straight as possible to the outside wall, with no more than 25 feet of total length and one 90-degree turn per 45 feet of duct.
- Use rigid metal duct or UL-listed flexible metal duct—never plastic or foil dryer duct, which can catch fire.
- Electric dryers need a dedicated 240-volt circuit; gas dryers need a 120-volt outlet and a gas line connected by a licensed technician.
- Seal all duct joints with metal foil tape, not duct tape, which degrades in heat.
- Test the vent for blockages and leaks before running the dryer for the first time.
Connecting the Vent Duct to the Dryer
The vent duct pulls hot air from inside the dryer and pushes it outside. Start by locating the vent outlet on the back or bottom of your dryer—consult the manual if you cannot find it. The outlet is usually 4 inches in diameter.
Slide the duct connector (a short metal piece that comes with most dryers, or sold separately) onto the dryer outlet. If your duct is flexible metal, push it straight onto the connector and find it with a hose clamp or metal foil tape. If your duct is rigid metal, connect it section by section, sealing each joint with metal foil tape as you go. Wrap the tape around the joint at least twice, pressing firmly so no gaps remain. Do not use duct tape—it breaks down in the heat and can clog the vent.
Run the duct to the outside wall as straight as possible. Every bend and extra length slows airflow and traps lint. Aim for no more than 25 feet of total duct length, and no more than one 90-degree turn per 45 feet. If your path requires multiple turns, you may need a larger-diameter duct or a booster fan to maintain airflow.
Running the Duct Through Walls and to the Outside
If the duct must pass through walls or a crawl space, drill or cut a hole slightly larger than the duct diameter. Slide the duct through and seal the gap around it with caulk or foam sealant—this stops air leaks and prevents pests from entering. Do not seal the duct itself; it needs to move slightly as the dryer vibrates.
At the outside wall, install a dryer vent hood (also called a termination cap). This is a hinged or louvered cover that lets air out but closes when the dryer is off, preventing cold air and pests from entering. find the duct to the hood with a hose clamp or foil tape, and caulk around the hood's edges where it meets the wall. Make sure the hood is not blocked by plants, snow, or lint buildup—check it monthly.
If you live in a mobile home or apartment where you cannot vent to the outside, a condensing dryer or heat pump dryer may be your only option. These models do not require an outside vent and instead collect moisture in a tank or drain it into a sink. They cost more upfront but use less energy.
Connecting Power to an Electric Dryer
Electric dryers draw a lot of current and require a dedicated 240-volt circuit. Most homes have a 30-amp or 50-amp breaker for the dryer, depending on the model. Check your dryer's manual for the exact amperage and voltage required.
If a 240-volt outlet already exists near the dryer location, plug in the power cord. If not, you will need an electrician to run a new circuit from your breaker panel. This is not a DIY job—improper wiring can cause fires. Once the circuit is installed, plug the dryer in and test it before loading clothes.
Some electric dryers come with a cord; others require you to hardwire them directly to the outlet. If your dryer has no cord, the manual will show you how to connect the wires. If you are unsure, hire an electrician. Do not use an extension cord or power strip—the dryer draws too much power and will overheat them.
Connecting Gas and Power to a Gas Dryer
Gas dryers need two connections: a 120-volt outlet for the motor and controls, and a gas line for the burner. The 120-volt outlet can be a standard household outlet within 6 feet of the dryer. If no outlet is nearby, an electrician can install one.
The gas line is the critical part. Do not attempt this yourself unless you are a licensed technician. Gas leaks are invisible and deadly. A technician will connect the gas line to your home's gas supply (or propane tank), test for leaks with a pressure gauge, and may support the connection meets local codes. This usually costs $100 to $300 and takes 30 to 60 minutes.
Before the technician leaves, ask them to show you where the gas shutoff valve is. If you ever smell gas near the dryer, turn off the valve when ready, leave the house, and call your gas company's emergency line. Do not use the dryer again until a technician has inspected it.
Testing the Vent and Running the Dryer for the First Time
Before you dry any clothes, run the dryer empty for 5 to 10 minutes to clear dust from manufacturing. Check that air is flowing out of the vent hood on the outside. If you feel little or no airflow, the duct may be kinked, too long, or blocked. Trace the duct from the dryer to the hood and straighten any bends.
Once airflow is confirmed, load a small batch of damp towels and run a normal cycle. Listen for unusual noises—a loud rumbling or squealing usually means a bearing or drum is failing, and the dryer should not be used until it is repaired. Check the vent hood again to make sure it opens fully and closes when the cycle ends.
After the first load, inspect the lint trap and the area around the dryer for lint accumulation. Lint is flammable and can block airflow. Clean the lint trap before every load, and vacuum behind and under the dryer once a month. If the dryer takes longer than usual to dry clothes, the vent is probably clogged and needs cleaning.
Common Mistakes That Reduce Airflow or Create Fire Risk
The most common error is using the wrong duct material. Plastic dryer duct and foil-lined flexible duct are cheap but dangerous—they trap lint, restrict airflow, and can catch fire if the dryer overheats. Use only rigid metal duct or UL-listed flexible metal duct. Check the packaging; it should say "UL listed for dryer venting."
The second mistake is running the duct too long or with too many turns. Every foot of extra duct and every 90-degree turn reduces airflow. If your duct is longer than 25 feet or has more than one turn, the dryer will work harder, take longer to dry clothes, and run hotter—all of which shorten its lifespan and increase fire risk.
The third mistake is sealing the duct with duct tape instead of metal foil tape. Duct tape degrades in heat, flakes off, and clogs the vent. Metal foil tape is designed for high-temperature use and will last the life of the dryer.
Finally, many people forget to check the vent hood regularly. A blocked hood forces hot, moist air back into the dryer, which can damage the motor and create a fire hazard. Check the hood monthly and clean it if you see lint or debris.
Frequently Asked Questions
Can I use a flexible plastic duct instead of metal?
No. Plastic and foil-lined flexible ducts trap lint, restrict airflow, and are fire hazards. Use rigid metal duct or UL-listed flexible metal duct only. The small cost difference is worth the safety gain.
What if my dryer is far from an outside wall?
If the duct run is longer than 25 feet or requires more than one 90-degree turn, airflow will suffer. Consider moving the dryer closer to an outside wall, using a larger-diameter duct, or installing a booster fan to push air through the long run. A booster fan costs $50 to $150 and can add 25 feet of effective duct length.
Do I need a permit to install a dryer vent?
Most jurisdictions do not require a permit for vent installation, but some do. Check with your local building department before you start. If you hire an electrician or gas technician, they will know the local rules and pull any necessary permits.
How often should I clean the vent duct?
Clean the lint trap before every load. Inspect the vent hood monthly and remove any lint or debris. If the dryer takes longer than usual to dry clothes, the duct is probably clogged and needs a professional cleaning—a technician can use a brush or air compressor to clear it.
What should I do if I smell gas near the dryer?
Turn off the gas shutoff valve when ready, leave the house, and call your gas company's emergency line from outside. Do not use the dryer or any electrical switches. A technician will inspect the gas line and connections to find and fix the leak.