UL Fact Finding Study
Underwritings Laboratories prepared a fact find report which shows, among other findings, that Dryer-Ells are 500% more airflow efficient than sectioned, small radius elbows.
From a volumetric air flowrate standpoint, Underwriters Laboratories' fact finding study shows a dramatic improvement when using the new long-turn dryer venting elbow versus a typical sectioned duct elbow. One of the findings is that it takes six LT90s to affect flowrate as much as a single sectioned elbow does.
Sectioned Dryer Elbow Duct-length Equivalency
Further, the study found the actual effect of sectioned dryer elbows is equivalent to 15 feet of straight pipe.
Engineered for Efficiency
Longer radius and smooth interior increases airflow efficiency.
Ten Inch Radius Smooth Dryer Duct Elbows