Dryer Vent Length

Click for a larger image.

Dryer vent length.

The exhaust airflow of any whirlpool produced dryer at the maximum rated vent length is at least. The exhaust duct run should be as short as possible. Dryer vent hoses that are run in a straight line from the dryer exhaust to the outdoors provide the best ventilation and reduce the likelihood of trapped lint. Clean old ducts before installing the dryer.

The airflow of a dryer depends on the design of the exhaust vent. Dryer venting comparison chart. Do not use plastic or thin foil ducting. 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 international residential code irc states that the maximum length for a dryer vent is 25 feet according to the national association of certified home inspectiors website. Run a tape measure between your dryer s exhaust vent and the vent hood. Record the measurement for later reference. The chart below shows the manufacturer recommendations for maximum vent length under various conditions.

Besides cleaning out caked on lint from dryer vent lines dryer vent wizard of wisconsin will also install and reroute dryer vent lines for maximum efficiency and safety. Vent length for vertical installations should likely be considerably less than the. The sheet below is a common length recommendation sheet that can be used for many dryers manufactured today. The code also defers to manufacturer s specifications which exceed the length allowed by the building code in some cases especially for long vent rated dryer models with a high volume air output.

The building code has formulas for determining the maximum length of a dryer vent however the flexible transitional duct that connects to it behind the dryer does not count. However there are a lot of variables that can enter into the equation. Measure the length between your dryer and vent hood. 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.

If your dryer vent is more than 25 feet long twisting and turning on its way to the exhaust vent contact a dryer vent wizard near you. Notice that the length you are allowed to safely run the dryer vent depends on which style of duct your use the amount of elbows needed and type of vent hood. When using a straight piece of flexible metal vent hose the maximum length allowed for safe ventilation is approximately 30 feet according to the appliance aid website. The ductwork recommended for use between the dryer in the wall should be rigid or semi rigid modeled ducting that is 4 inches in diameter.