Gas Dryer Exhaust Vent Length

If you have to install bends you should reduce this limit by 5 feet for every 90 degree bend and 2.

Gas dryer exhaust vent length.

Dryer venting comparison chart. Clean old ducts before installing the dryer. The vent should be as straight as possible and the code sets a limit of 25 feet on its length. 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.

Let s start with what the irc international residential code says. The maximum length of a straight run of dryer duct is 35 feet with a 5 foot deduction in length for each 90º bend and half that for 45º bends based on using a 4 inch smooth metal vent with no screws protruding into the air flow. That 25 feet is based on a straight run of vent piping if there are any bends in the line. Because all types are sold for use with dryers you would naturally assume that all are suitable for this application.

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. Check your manufacturer s instructions on how to install a dryer vent for longer distances. The exhaust airflow of any whirlpool produced dryer at the maximum rated vent length is at least. Vent length for vertical installations should likely be considerably less than the.

Long runs of vent line with multiple bends reduce the flow of air often to the point where the dryer exhaust doesn t even reach the exhaust vent. 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 first step of installing a dryer vent in a new location is to map out a path for the ductwork. However there are a lot of variables that can enter into the equation.

Do not use plastic or thin foil ducting. The airflow of a dryer depends on the design of the exhaust vent. Some are flexible and others are rigid. The length of the run should be no more than 25 feet.

The chart below shows the manufacturer recommendations for maximum vent length under various conditions. The route should be as short as possible but there are other guidelines to follow when venting a dryer. The exhaust duct run should be as short as possible. 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.

Most dryer ducts are round and 4 inches in diameter. Dryer vent pipes properly called vent ducts come in a variety of materials.