Dryer Vent Length

Clean old ducts before installing the dryer.

Dryer vent length.

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. 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. Your new dryer is shifted to vent to the rear. Measure the path as if the hose were already assembled to account for any curves or bends.

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. However there are a lot of variables that can enter into the equation. The exhaust airflow of any whirlpool produced dryer at the maximum rated vent length is at least. The chart below shows the manufacturer recommendations for maximum vent length under various conditions.

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. The airflow of a dryer depends on the design of the exhaust vent. 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. 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.

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

Click for a larger image. Measure the length between your dryer and vent hood. Record the measurement for later reference. Do not use plastic or thin foil ducting.

The sheet below is a common length recommendation sheet that can be used for many dryers manufactured today. Vent length for vertical installations should likely be considerably less than the. 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. Dryer venting comparison chart.