How far can I vent a dryer

The maximum developed length of a clothes dryer exhaust duct shall not exceed 35 feet from the dryer location to the wall or roof termination. The maximum length of the duct shall be reduced 2.5 feet for each 45-degree (0.8 rad) bend, and 5 feet for each 90-degree (1.6 rad) bend.

Does it matter how long your dryer vent is?

A dryer vent should not exceed 35 feet in length. Furthermore, for every 45 degree turn of a dryer vent you should remove 2.5 feet in total allotted length. For every 90 degree turn, you should remove 5 feet in total allotted length.

Can you run a dryer vent vertical?

It’s OK to vent vertically up to the attic, as long as you are (as you plan to be) carrying on and venting to the outside. To determine whether your total length of vent and number of 90 degree turns is OK, you’ll need to consult your dryer’s owner’s manual for the data.

Is it bad to have a long dryer vent?

Keep exhaust duct as straight and short as possible. Exhaust systems longer than the manufacturer’s recommendations can extend drying times, affect appliance operation and may encourage lint build-up on pipe lining.

What is code for a dryer vent?

Dryer venting systems are covered in the International Residential Code (IRC) at M1502 – Clothes Dryer Exhaust. Here’s a summary of the requirements: Dryers must be exhausted in accordance with manufacturer’s instructions (IRC M1502.

Can PVC pipe be used for dryer vent?

Currently, PVC, Vinyl, or aluminum foil material is still common in plumbing applications. However, manufacturers do not permit their use for venting a dryer. PVC or Vinyl duct trap can easily melt because of the hot air coming from the dryer.

Can insulation touch a dryer vent?

Every inch of the metal surface of the dryer vent must be protected in order for the insulation to do its job. … If your vent runs through a duct compartment, you can fill the entire compartment with fiberglass insulation, so long as the pipe is completely covered.

Can a dryer vent go sideways?

Horizontal dryer vents are suitable for apartments and homes without basements that have a laundry room on the first floor. They can even be installed in hallway closets that hide the washer and dryer. A horizontal dryer vent runs in a straight line from the back of the dryer to the outside of the home.

Is it better to vent a dryer up or down?

It’s fine for the dryer vent to rise vertically to enter the building ceiling, but within the ceiling the vent should slope downwards towards its exit point at the building exterior wall.

Can a dryer vent run upwards?

You can direct your dryer vent upward to reach a horizontal connection or extend all the way to, and through, your roof.

Article first time published on

How far should dryer vent be off ground?

Set the vent a minimum of 12 inches above the outside ground. Pro tip: Use no more than 25 feet. of 4-inch duct, and subtract 5 feet for every 90-degree turn and 2 1/2 feet for every 45-degree turn for dryer vent installation.

Are flexible dryer vents legal?

White vinyl spiral ducts are still found in many homes, but are not UL approved for clothes dryer transition ducts. They’re very unsafe, burn more easily than foil ducts, and are prohibited by most building codes and appliance manufacturers. Using white vinyl transition ducts will void most dryer warranties.

Is it OK to vent a dryer under the house?

2: It’s OK to vent a dryer into the crawlspace or attic, rather than all the way outside. DO NOT vent your dryer directly into a crawlspace, basement or attic.

How can I vent my dryer without outside access?

The best way to vent a dryer without outside access is to run a vent hose through a window or to run a vent hose up through your attic space to a dryer vent on your roof. Alternatively, you can vent your dryer into your home and install a vent cover.

Can a dryer vent go into a crawl space?

Vented air from the dryer is full of moisture since it contains water from the clothing being dried. Do not vent it into your crawlspace or basement since you will definitely have moisture problems.

Can I vent my dryer into the garage?

If you have a gas-fired dryer, it’s not only a bad idea to vent it into your garage, it’s potentially deadly. Gas-fired dryers eject small amounts of carbon monoxide, and it’s critical that they’re properly vented to the outdoors. … Dryer vents should be as straight as possible and not exceed 35 feet in length.

Should dryer vent be insulated in attic?

DRYER DUCTS DON’T NEED TO BE INSULATED. But if it’s running through a crawl space, unheated basement, attic or other unconditioned space where there’s the potential for freezing, then it is recommended to insulate the duct.

Can a dryer vent touch wood?

Yes, that is considered safe. Direct wood contact is not a problem with the operating temperature of a dryer vent. You’ll have no fire if the vent is clear. lint does not escape from the pipe if all joints are foil taped.

What can I use for a dryer vent?

01 of 05. Aluminum Foil Duct. Image by Marie LaFauci / Getty Images. …
02 of 05. Semi-Rigid Metal Duct. Kameleon007 / Getty Images. …
03 of 05. Slim Duct. …
04 of 05. Rigid Metal Duct. …
05 of 05. Plastic or Vinyl Duct.

What is best for dryer vent?

Most professionals and home experts agree that aluminum dryer vents perform most effectively for the majority of homes. Other common types of dryer vents include flexible steel and metal.

What happens if you can't vent your dryer outside?

Mold and Moisture Issues That’s a problem. Venting your dryer into your home means greatly increasing the risk of exposing your family to toxic mold spores and aggravating mold allergies. In addition to feeding mold, moist air trapped inside your home can lead to structural issues.

Can I run a dryer vent inside a wall?

Dryer vents should not be installed in ways that make them difficult to clean and inspect. Any vent in a wall cavity should be made of solid metal, with all joints sealed with metallic tape. There should not be any tight turns and they also need to be sized properly to the distance run.

Do dryers need to be vented outside?

Indoor vs. Exhaust from gas dryers must be vented outside because it contains carbon monoxide. … When the times comes to clean your external dryer vent, you’ll need to go outside to access it. Neither indoor nor outdoor dryer vents should be connected to plastic dryer ducting, to avoid a potential fire hazard.

How far can you vent a dryer horizontally?

The maximum developed length of a clothes dryer exhaust duct shall not exceed 35 feet from the dryer location to the wall or roof termination. The maximum length of the duct shall be reduced 2.5 feet for each 45-degree (0.8 rad) bend, and 5 feet for each 90-degree (1.6 rad) bend.

Should a dryer vent slope?

A best practice is to have the exhaust terminal located so that the exhaust duct will run horizontally with a slightly downward slope (1/4-inch per foot) to reduce the possibility that condensation will form. … The hood opening should point downward and should be at least 12 inches above the ground.

Does dryer vent need to slope?

Vent pipes, often narrower than drainpipes, need not slope like drainpipes. … Vent pipes must be installed so they stay dry. This means that they should emerge from the top of the drainpipe, either straight vertically or at no less than a 45-degree angle from horizontal, so that water cannot back up into them.

Where should a dryer vent be placed?

It’s best to route the dryer vent in a horizontal path to the home’s outside wall. All horizontal runs should pitch 1/4-inch per foot to the outside. This will help to avoid moisture from sitting in the pipe or draining back to the dryer.

How much room does a dryer vent need?

Dryers also need extra space for adequate ventilation. Around six inches of space behind your washer and dryer is ideal. Space can be saved behind a dryer by installing a periscope dryer vent. This helps ventilate the areas quickly and thus allows the dryer to sit closer to the wall.

Is flexible foil duct safe?

Flexible Foil Dryer Duct Like vinyl ducts, these ducts impede airflow and trap lint. Aluminum foil won’t burn, of course, but it will quickly disintegrate in a fire. Dryer manufacturers don’t recommend foil ducts and neither do we.

Is it code to vent a dryer through the roof?

According to building codes, dryers must vent to the exterior. … When dryers are on interior walls with no direct route to the exterior, they can vent through the roof. Dryers venting through the roof need rigid metal ducting that extends straight to the roof exterior.

Do indoor dryer vents meet code?

It is recommended that clothes dryer vents are required to terminate air fumes outside the building and not less than 3feet in any direction of openings leading into buildings.