Clothes Dryer Exhaust Duct Length

Let s start with what the irc international residential code says.

Clothes dryer exhaust duct length.

Length is only if it s a straight line from the dryer to the exhaust which it rarely ever is. 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 exhaust airflow of any whirlpool produced dryer at the maximum rated vent length is at least 105 cfm. Measuring about 25 feet in length and 5 inches in diameter the terrabloom can be compressed up to 2 5 its original size.

This includes standard vent and long vent dryer models. 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. 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. Industry standards recommend that the maximum concealed rigid metal ducted clothes dryer vent length be no more than 25 feet irc.

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. That 25 foot maximum length should be reduced by 2 1 2 feet for each 45 degree bend in the ducting and by another five feet for each 90 degree bend in the vent duct. Terrabloom 6 inch by 25 feet flexible if your definition of the best dryer vent hose for tight space is something compressible then the terrabloom is for you. 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.

Clean old ducts before installing the dryer. The maximum airflow is 230 cfm. Some codes permit 35 feet. The irc also leaves it up to the dryer manufacturer to specify the diameter of the vent hose to use.

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. It allows homeowners to use one 8 foot length of flexible pipe to transition from the dryer to. The maximum length of the. The exhaust duct run should be as short as possible.

Do not use plastic or thin foil ducting. The maximum length of the duct shall be reduced 2 5 feet 762 mm for each 45 degree 0 8 rad bend and 5 feet 1524 mm for each 90 degree l 6 rad bend.