1:5:10:365 EcoTip Blog

March 12, 2008

:072 Dryer Duct Length

fantech.jpg

credit: Fantech

Suggested Review – :071

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet.

1:5:10:072 Tip: Check the length and number of angles for your clothes dryer’s ductwork. Ducts that are too long or have too many angles will slow drying and waste energy.

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Additional Information

The International Mechanical Code article 504.6 stipulates the requirements for Domestic clothes dryer ducts. In brief, the maximum length of duct permitted is 25 ft. This maximum length should be reduced by 2.5 ft for each 45-degree bend and 5 ft. for each 90-degree bend. The duct should be a minimum nominal size of 4 inches in diameter and shall have a smooth interior finish.

When a short dryer duct length is not possible, the “Advanced Dryer Booster Fan” by Fantech can assist in over coming the resistance by ensuring that moist air exhausts quickly. This reduces drying time and energy costs. The manufacture says their fan is suitable for duct runs of up to 60 linear feet of rigid duct with up to six elbows. 

www.fantech.net.

http://www.fantech.net/dryer_boosting.htm

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March 11, 2008

:071 Clean Dryer Duct

dryer.jpg

credit: http://www.cpsc.gov/CPSCPUB/PUBS/5022.html

Suggested Review – none

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet.

1:5:10:071 Tip: Clothes dryer ducts and lint screens should be cleaned on a regular basis to help prevent accumulation. This is important for fire prevention and results in more energy efficient drying (of course solar dryers* work even better).
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Additional InformationThe U.S. Consumer Product Safety Commission estimates that in 1998, clothes dryers were associated with 15,600 fires, which resulted in 20 deaths and 370 injuries. Fires can occur when lint builds up in the dryer or in the exhaust duct. Lint can block the flow of air, cause excessive heat build-up, and result in a fire in some dryers.

Information about cleaning dryer ducting is available at:

http://www.cpsc.gov/CPSCPUB/PUBS/5022.html

* solar dryer: clothes line

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February 12, 2008

:043 Sealing Ducts

Filed under: :043 Sealing Ducts — Tags: , , , , , , , , , — John Banta @ 12:01 am

Suggested Review – :039, :040, :041, :042

Today’s 1:5:10:365 Tip provides information about sealing leaky duct-work.

1:5:10:043 Tip: Leaky furnace ducts and connections result in energy loss. They should be sealed using secure strapping and an HVAC system approved mastic. Duct tape tends to fail – often with expensive results.

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Additional Information

EPA’s EnergyStar program has excellent information on correcting duct leaks at: http://www.energystar.gov/index.cfm?c=behind_the_walls.btw_ducts

duct_problems.jpg 

Major sources of leakage include:

A. Leaky duct connections

B. Leaky return ducts

C. Furniture blocking registers

D. Leaks at furnace and air filter slot and duct tape failures

E. Fallen duct insulation

F. Leaky supply ducts

G. Kinks in duct-work restricting airflow

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February 11, 2008

:042 Duct Leakage

noc20070101_0146.jpg Fluke IR Fusion Source: Restoration Consultants www.moistureview.com

Suggested Review – :039, :040, :041

Today’s 1:5:10:365 Tip for becoming a better steward for our home and planet deals with finding ductwork leaks to prevent and energy waste and save money.

1:5:10:042 Tip: Thermal imaging and duct blaster testing are two techniques that can be used to identify duct leakage. When ducts leak into attic, crawlspaces or wall cavities, they waste energy by heating or cooling a space that is not occupied or supposed to be conditioned. Air conditioned air leakage into these unintended areas may result in moisture condensation and mold growth. Air pressure differences created by the leaks can suck or blow insulation, dust and other air pollutants into the occupied space.

Tomorrow I will talk about ways to correct duct leakage.

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Additional Information

inspect2.jpg Duct Blaster

Source: http://www.energystar.gov/index.cfm?c=behind_the_walls.btw_inspection

An energy audit using a duct blaster will tell you how much energy is being lost. A thermal imaging scan can indicate where the leaks are located. Thermal scans of the building envelope are best done when there is at least a 20 degree temperature difference between the inside and outside. Duct work evaluations can be done any time of year as long as the system is either heating or cooling.

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