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January 7, 2010
Vol. 5, Issue 1

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Hi , happy building!


This Month's Topic:

     Dryer Taking Too Long To Dry Your Clothes? (Part 1)

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Dryer Taking Too Long To Dry Your Clothes? (Part 1)

Your brand new dryer—just installed in your brand new house—is taking forever to dry your clothes. What’s wrong? Could it be that the dryer and the vent don’t match?

A dryer is meant to be placed against an outer wall and vented directly out of the building. If the location of the laundry room in your new home doesn’t allow for this contingency, extensive duct runs may be required to expel the dryer’s moist, hot air out of doors.

Every manufacturer provides specifications indicating the maximum duct length at which the dryer is capable of expelling moist, hot air and lint (venting). If this length exceeds the power of your dryer, the dryer will not be able to do its job.

How can you make sure the dryer and the dryer vent will be compatible in your new home?

  • Take note of the maximum duct length specified in the dryer installation manual. Duct-length specifications vary wildly among brands and models. For example, some dryers support a maximum length of 150 feet of rigid duct, while others cap the duct length at 43 feet.
  • Based on the equivalents provided in the installation manual, calculate the length of your vent, allowing for transitions and adaptors. (Although his exercise should be done by duct installer, you can do it as well.) Elbows, transitions, and vent hoods (wall or roof caps) all present additional resistance to airflow; thus, each is determined by the manufacturer to be equivalent to a section of straight duct. For example, let’s suppose the installation instructions for your dryer indicate that an elbow is equivalent to 10 feet of straight duct and a 2 ½ inch wall cap (see photo below) to 23 feet of straight duct. If the dryer vent in your new home is 25 feet long, with two 90-degree elbows and a wall cap, the dryer will need enough power to move lint 48 feet (25 feet of straight duct + 20 feet for the two elbows + 23 feet for the wall cap).
  • NOTE: Remember that maximum dryer vent duct length and transition/adaptor equivalents are different for every dryer. Thus, it’s critical that you use the duct calculation information for your specific machine.Dryer Vent Rigid Dryer Vent

    Another factor that affects maximum vent length is the type of duct material. Although the flexible metal ducting shown far right is easier for your installer to work with, it is not the recommended choice. Due to its corrugated design, metal flex duct reduces airflow and contributes to lint buildup. Over time, this lint buildup not only reduces the efficiency of your dryer, it is also a fire hazard.

    Round, rigid metal is the preferred choice for ducting material as shown in the photo to the near right.

    Even the vent hood (wall cap) at the exterior of your home has an effect on dryer efficiency. The tight, flat, 2 ½ inch hood shown below on the left impedes airflow and increases the equivalent duct run. For this type of vent, I’ve see the equivalency charts add anywhere from 10 to 30 feet. The curved, deeper design on the right offers less resistance; the screen over the vent also keeps out critters. Building codes in some areas of the country state that screens should not be installed at the duct termination. For information on this vent by Heyoka Solutions, Click Here

    Vent Heyoka Vent

     

     

     

     

  • Compare the calculated total to the maximum duct length specified for your dryer. After you’ve completed the calculations in Step 2 above, compare your findings to the maximum length of duct specified in the installation instructions for the dryer. If the length of the duct exceeds the maximum allowed, you have two options: Select a dryer with the capability to handle the situation or add a booster fan.

In next month’s ezine, I’ll explain how dryer / duct specs are communicated on a job site, give you the skinny on booster fans and why to avoid them, and tell you about another product that improves dryer-duct airflow.

Wishing you all a safe and prosperous New Year!


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Tracy DeCarlo, author of "The Difference is in the Details" publishes the idea-packed, monthly e-zine "Tracy's Home Building Tips." If you're ready to learn how to plan a more durable, energy-efficient, and easy-to-live-in home, get your FR*EE tips now at www.DetailedSolutions.net.

Tracy DeCarlo owner of Detailed Solutions, Inc. and One Stop Green Home Certification, has more than fourteen years' experience in the residential construction industry. As a Home Building Function Analyst, Certified Green Professional, Green Certifying Agent, and Certified Aging-in-Place Specialist, Tracy addresses the functional aspects of home construction, design, and usage, including items such as energy efficiency, disaster mitigation, air quality, aging in place, green building, plumbing, electrical, lighting, and storage.

By working with homeowners to focus on their daily habits and preferences, she helps them create living spaces that support and compliment their lifestyles, while at the same time teaching techniques to manage the bottom line.

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