Dryer Vent Length

Run a tape measure between your dryer s exhaust vent and the vent hood.

Dryer vent length.

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. 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. Vent length for vertical installations should likely be considerably less than the. Clean old ducts before installing the dryer.

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. Measure the path as if the hose were already assembled to account for any curves or bends. The recommendations can change from model to model even on the same brand s products so consult the owner s manual or installation instructions for your specific model. 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.

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. 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. Dryer venting comparison chart. 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 exhaust airflow of any whirlpool produced dryer at the maximum rated vent length is at least. 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. Click for a larger image. Measure the length between your dryer and vent hood.

The chart below shows the manufacturer recommendations for maximum vent length under various conditions. Your new dryer is shifted to vent to the rear. Do not use plastic or thin foil ducting. 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.

Record the measurement for later reference. The airflow of a dryer depends on the design of the exhaust vent. However there are a lot of variables that can enter into the equation. The sheet below is a common length recommendation sheet that can be used for many dryers manufactured today.