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Did You Know... 6 Facts about Clothes Dryer Exhaust Safety

  1. According to manufacturer’s specifications and local codes, dryer ducts must be a minimum of 4 inches in diameter and at least as large as the dryer outlet.

  2. Unless otherwise specified by the dryer’s manufacturer or local code, the developed length of the dryer’s exhaust duct should not exceed 25 feet. (When determining developed length, each 90 degree turn adds 5 feet to the actual length.)
  3. Dryer vents shall be independent of all other systems and terminate outdoors, not into a chimney, crawl space, or attic.
  4. The outside dryer exhaust vent’s termination hood should be equipped with a back draft damper to ensure that the exhaust doesn’t come back into the home. 
  5. Metal transition ducts should be used between the dryer and the exhaust duct.
  6. Flexible transition ducts should never be used in an attic, a crawl space, or inside a wall.

Information provided by the Chimney Safety Institute of America (CSIA) Public Safety Bulletin


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