| Dryer Duct Vent Elbow Comparison |
| Length of Run Improvements Delivered by the Dryer-Ell |
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| Dryer
Vent Elbow Comparison - Underwriters Laboratories |
Venting Elbow Volumetric Air Flowrate Comparison
Underwriters Laboratories completed a 2006 fact finding study that shows a dramatic improvement in air flow
when using the new long-turn dryer venting elbow versus a typical sectioned duct elbow. One of the
findings is that it takes six long turn dryer elbows to have the equivalent affect on flowrate as a single sectioned elbow.
Sectioned Dryer Elbow Duct-length Equivalency |
| Dryer
Vent Duct Run Impact - Current Code |
Length of Run Penalties under Current Dryer Venting Code
Most code, today, still reflects only a five foot reduction in length-of-run for every ninety degree turn in the duct. This seeming disparity, however,
is somewhat offset by the very short overall run length allowed (most dryer OEMs allow longer). There are proposals before the ICC to bring both variables closer
together. For now, there is a 5 foot reduction for every typical elbow from an overall 25 feet in allowable length.
- 504.6.1: 25 feet less 5 feet for each typical 90 degree elbow
- M1502.6: 25 feet less 5 feet for each typical 90 degree elbow and 1.5 feet for each long turn elbow.
Current Allowable Duct Length Under Dryer Venting Code 
Based on accepted ASHRAE methodology for calculating friction loss in ducts and fittings, this new elbow provides key benefits to the builder and tradesmen by
removing the 5 foot reduction consequence found in most building codes. Section M1502.6 of the 2006 International Residential Code permits large radius
elbows. Click HERE for Calculations and Engineering Reports.
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