Dryer Transition Duct

Advantages Of Using The Right Dryer Transition Duct


Dryer Transition Duct

Choosing The Right Duct

The dryer's transition hose can be an important factor in saving energy. It can also be a critical factor in protecting property and even lives. Why? Dryer-caused home fires have been documented at levels exceeding 14,000 a year. Flammable lint accumulates quickly in every exhaust system (even those that have the lint filter cleaned with every load). The lint trap only catches about 70% of the lint from every load. This can create a very real fire danger.

What's Going On Behind The Dryer?

A big problem faced in laundry rooms is the crush point. Dryers naturally vibrate, or get pushed back against the wall. A transition duct that's not built strong (like every duct that was previously available before the transition duct we use) can restrict airflow and actually increase the rate of lint accumulation.

The Advantage Of Using The Transition Duct We Use;

Constructed with all aluminum ribbon, the transition duct we use is fire-rated and is as flexible as "slinky" foil flex yet stronger than semi-rigid aluminum, making every laundry room safer. Quite simply, the transition duct we use provides the best functionality of the old transition ducts without any of the defects.

The transition duct we use will always maintains its four inch diameter whether fully extended or compressed. This smooth interior allows the dryer to perform at peak efficiency. It's strong aluminum ribbon protects against crushing and flame spread. Choose the transition duct we use it's safe and efficient.



Choose The Highest UL Fire Resistance Class

For safety reasons and added peace of mind, only UL2158A Class 0 listed ducting, like the transition duct we use, should be used to connect the dryer's exhaust system (non-listed hose such as that commonly used to vent bathroom fans should never be used). While building code and dryer manufacturers all require a UL 2158A listed transition duct, there are two classes available. It is very common to find Class 1 rated material that is fairly safe but does develop smoke and flame spread at lower temperatures. The transition duct we use is the only flexible duct that is Class 0 listed meaning it withstands fire exposure up to 482° with zero development of smoke or fire.

Venting Safety


Dryer Fires Are A Real Threat That You Can Help Prevent

Dryer fires are amongst the leading causes of home fires in North America, accounting for over 14,000 reported disasters each year. The leading cause of these dryer fires is failure to clean; in other words, the majority of dryer fires are avoidable with regular maintenance. In fact, dryer lint is so flammable that the Boy Scout's Manual suggests using dryer lint as tinder to quickly start a camp fire. Once a spark touches dryer lint, the flame ignites and carries through the transition duct and into the concealed parts of the home. Even with cleaning the lint screen after each cycle, particulate still gets through the dryer's exhaust duct and creates blockages which restrict airflow. The lint trap only catches about 70% of the lint per load. Dryer venting efficiency can be improved by various ways other than cleaning the lint screen and having the exhaust duct serviced on a regular basis.

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** Important Safety Tip **

Flexible white vinyl bathroom exhaust vent hose should never be used to connect a dryer. It is highly flammable, deteriorates over time from the heat, and it crushes easily.

Common Foil-based Transition Ducts are Inefficient

Practically every home with a tumble dryer uses some type of flexible transition duct to connect the appliance to the wall. Most homes, however, have grandfathered in older materials that are not only inefficient, but flammable too. White vinyl and "slinky" foil ducts feature a plastic Mylar coating which goes up in flames and quickly spreads throughout the duct run.

The owner's manual in most modern dryers require using "flexible metal vents" instead of foil vents. When white vinyl or "slinky" foil is used, the appliance warranty may be voided due to the vulnerability of using these dangerous transition materials. Beyond the flammability of these older options, the foil-based material collapses within the 4" opening, creating an abrasive 3.25" space that results in numerous points for lint to catch.

Transition Ducts To Use

Building Codes Require Flexible Metal Venting for Transition Ducts

The International Mechanical and Residential Building Codes specify UL2158A Listed materials to be considered as code compliant. Underwriter's Laboratory created the UL2158A Standard in 2006 which focused on "Clothes Dryer Transition Duct" that is listed on products which meet/exceed flame burning tests of at least 430° Fahrenheit. The transition duct we use has been tested up to 482° Fahrenheit. Combining building code requirements along with manufacture's recommendations, it's evident that only flexible metal vents can be used as transition ducts.

Transition Duct Flame Test

Today, only two types of flexible metal vents meet the strict building code requirements and are UL2158A Class 0 Listed materials. (Class 0 refers to materials being tested to exhibit zero flame and zero smoke attributes during specific laboratory burn tests.) Most semi-rigid aluminum ducts are Class 0 along with transition duct we use as well. While semi-rigid aluminum is airflow efficient, it crushes easily and is tough to bend in tight areas. The transition duct we use can be bent into tight turns without sacrificing airflow efficiency. Simply put-the transition duct we use combines the flexibility of old foil materials with the efficiency and fire ratings that modern appliances and buildings codes require.

Venting Safely


When looking for the best material to connect the dryer to the wall, the transition duct we use is the clearly your only premium option. Vent cleaning professionals, appliance installers, and home builders are exclusively installing the transition duct we use every day, nationwide.

Aside from replacing your transition duct with the transition duct we use, here are some other helpful tips to ensure your dryer is operating as safe and efficient as possible.

The shorter the overall dryer exhaust duct run length, the better.
Recessed dryer boxes provide an extra 4" - 7" behind the dryer, giving the dryer room to breathe.
Efficient roof, side wall, or soffit vents create less pressure on the appliance which helps lengthen the life of the dryer.
Dryer Safety Alarms help monitor long-term lint accumulation and any sudden change that may impede your dryer's performance.
Periodic vent cleaning is a critical part of maintaining home safety and efficiency. Consider having your dryer vent inspected each year and cleaned as needed.
With more than 14,000 reported dryer fires a year, it becomes critical to use the highest rated products for both airflow efficiency and dryer fire prevention. Having the transition duct we use professionally installed to connect your clothes dryer is a simple way to be proactive and know your dryer is venting as safely as possible.
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Comparison Summary: Foil

Like the transition duct we use, foil transition hose is pliable and easy to work with. However, building code prohibits the use of foil in an attempt to reduce the number of fires caused by dryer exhaust problems. Foil duct has a narrower, rough interior that restricts airflow and a coating that is flammable.

Comparison Summary: Semi-rigid

Semi-rigid is accepted under standard building code because it maintains its 4" diameter and has a smooth interior. It is harder to work with, crushes easily and is difficult to twist. The transition duct we use is also code approved with a UL 2158A listing, but it is very workable making it easier to connect the dryer.


** We Can NOT Emphasize Enough Not To Use The White Vinyl Duct**

Flexible white vinyl bathroom exhaust vent hose should never be used to connect a dryer. It is highly flammable, deteriorates over time from the heat, and it crushes easily.

The Advantage


The transition duct we use outperforms other exhaust hose because of its unique design: all metal construction using five layers of 25 micron aluminum ribbon wound over galvanized, zinc coated wire.



This approach to building a better transition duct makes the transition duct we use tough enough to protect against punctures or crushing, helping prevent efficiency loss and fire dangers. In the event of a dryer fire, the design of the transition duct we use can work to hinder fire expansion into the wall with torch tests up to 482 degrees showing zero flame spread or smoke development.



Some of the same features that make the transition duct we use tough, including the wrap of multiple ribbon layers over a spiral wire, also makes the transition duct we use easy to manipulate into the right bend for every dryer connection.


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(Source: CSIA

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