Improper dryer exhaust installation is even common in newer homes and just as much a fire hazard as in the older homes
Chicago, IL - Mory Matias, owner of Dryer Vent Wizard in Chicago, recently inspected a dryer exhaust system in a newer home. The homeowner was confident that everything would be correct and up to code because the home was less than one year old.
Mory looked behind the clothes dryer and he was happy to find that the proper material was used for the dryer ducts; semi-rigid metal instead of corrugated plastic or vinyl. The pieces were joined with metal tape rather than screws that protrude into the inside of the ducts to catch and trap lint.
Mory followed the duct to see where it ends; he was disappointed to find that it went right into the attic. "There was a pile of lint in the attic and I could see that mold and mildew was growing on the rafters," said Mory. "Mold will eventually cause the rafters to rot. Mold spores in the home cause upper respiratory problems for people too. By law, the dryer must be vented outdoors. If you have a gas dryer, you are also risking carbon monoxide in your home."
Mory also explained the importance of properly insulating a dryer duct that goes through the roof to prevent condensation from running down and perhaps pooling behind the clothes dryer. It is also important to have the proper type of exhaust hood with a wide flange for dryers that are vented through the roof.
The best dryer exhaust system is made of semi-rigid metal, smooth inside, joined with metal tape and is as short and straight as possible. Mory explained, "The longer your dryer exhaust pipe is, the more resistance there is to air-flow. Bends and turns also cause resistance. Proper air-flow is essential for a clothes dryer to work safely and efficiently, saving energy and preventing fires."
Mory Matias, owner of Dryer Vent Wizard provides professional dryer vent inspections, dryer vent cleaning, repair and installation in the Chicago area. http://www.dryerventwizard.com has a policy that all technicians explain to their customers how their dryer exhaust system works and how to properly maintain the system between annual professional visits.