Dryer Exhaust Vent Length

However that 25 ft.

Dryer exhaust vent length.

A ul listed semi rigid dryer duct can be used if the vent length is 8 feet or less. See your installation instructions. We have a semi rigid flexible transition dryer duct part pm08x10085. For example foil dryer ducts can only be used in lengths 8 feet or less.

The maximum airflow is 230 cfm. 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 exhaust airflow of any whirlpool produced dryer at the maximum rated vent length is at least 105 cfm. Let s start with what the irc international residential code says.

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. Ul listed foil dryer ducts are only allowed under very strict criteria. The international residential code irc section m1502 clothes dryer exhaust guidelines states that a dryer exhaust duct should not exceed 25 feet from the dryer to the exhaust vent in the wall or roof. 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.

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. If you have to install bends you should. They do not even provide any vent length data for such an installation. 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.

Because the weight of the moist dryer air is much heavier than ambient air i would think the maximum vent length would be less than 1 2 or 1 4 of the acceptable length of a horizontal vent run. 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. When installing your lg dryer it is important to properly install your dryer vent to maximize your dryer performance and to prevent any issues from occurring. However there are a lot of variables that can enter into the equation.

That 25 feet is based on a straight run of vent piping if there are any bends in the line. Length is only if it s a straight line from the dryer to the exhaust which it rarely ever is. The vent should be as straight as possible and the code sets a limit of 25 feet on its length.