Laundry Ventilation Solutions Brochure

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Laundries
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Dryer Exhaust Duct Power
Ventilator
DBF4XLT-705
Such preferences often result in longer duct runs with multiple bends and
turns that impair dryer efficiency and interfere with a builder’s ability to
meet building code. A properly applied dryer exhaust fan, preferably one that
meets the latest UL Standard, may be the only solution that makes everyone
happy – including the home inspector and the local fire chief.
The 2012 International Residential Code (IRC) is pretty specific when it
comes to dryer exhaust venting. The maximum length for dryer exhaust duct
cannot exceed 35 feet from the dryer location to the wall or roof termination.
Each elbow reduces this maximum allowable length by 5 feet since the
restricted airflow that these fittings create is more than the same length of
linear duct. Each dryer exhaust has its own specifications for duct length,
so contractors should refer to these instructions, as well, to make sure the
dryer duct length does not exceed a particular model’s capability. Given
these restrictions, it is highly likely that dryers located in interior spaces will
exceed either the IRC or the manufacturer’s limits on duct length.
For years, these fans have been applied with great success in homes with
excessively long dryer exhaust duct runs. And many homeowners, once
burdened with long dryer cycles and perpetually damp clothes, have been
delighted with the results.
Underwriters Laboratory (UL) has since
developed a supplement to UL705 that
does specifically address the safety of fans
used to facilitate proper dryer exhaust and
has given the product a new name, Dryer
Exhaust Duct Power Ventilator (DEDPV).