What Is The Maximum Length For A Dryer Vent Hose

Length is only if it s a straight line from the dryer to the exhaust which it rarely ever is.

What is the maximum length for a dryer vent hose.

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 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. Double check to make sure that this type is approved for your dryer and allowed by local code. If you have to bend the duct into a 45 degree angle you should remove 2 5 feet per bend.

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. If you have no choice except to vent through the roof purchasing a extended vent dryer if available might help but still keep the total vent length well reduced of the manufacturer s recommendations. If you have to install bends you should reduce this limit by 5 feet for every 90 degree bend and 2. The vent should be as straight as possible and the code sets a limit of 25 feet on its length.

These guidelines will usually provide a maximum length for ductwork venting a dryer. 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. However that 25 ft. Vent cap with wide four inch opening or mini louvers and smooth metal pipe total pipe length can be 64 feet with no bends.

If you have to run a long length of duct you should consider the local building code. Foil duct is held in place with dryer clamps or large hose clamps. Use the tables below to calculate how far your vent can be from the dryer. Transition ducts must not be concealed inside walls or other building cavities and usually have a maximum allowed length of eight feet.

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. 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. Let s start with what the irc international residential code says. A rule of thumb to follow is that it should have a maximum length of 25 feet.

However there are a lot of variables that can enter into the equation.