Every Dryer-Ell increases airflow efficiency and can be measured the same as a straight pipe.
The Dryer-Ell Advantage:
- Simplifies Installation - No Electrical Work
- Eliminates a Mechanical Point of Failure
- Requires no Regular Maintenance
- Saves Money and Energy
Code Approved - 500% More Airflow Efficient - ZERO Run Length Penalty
Install the Dryer-Ell to overcome length of run issues and increase efficiency. Its longer radius and smooth interior reduce friction loss. In fact, UL has proven it to be 500% more airflow efficient than sectioned elbows.
Dryer-Ells are ten-inch radius, smooth interior elbows that reclaim allowable duct length. Based on the ASHRAE methodology for calculating friction loss, they can be measured the same as a straight pipe. This removes the run-length penalty most code requires for every elbow.
Adopted in ICC International Mechanical and Residential Code, Dryer-Ells can be the perfect solution for length-of-run issues. The Dryer-Ell increases dryer efficiency, and--when replacing a restrictive small radius elbow--it can be used as an alternative to expensive booster fans.
Unlike sectioned elbows, the Dryer-Ell allows the use of the full code-allowable length of the run. Generally, the building code requires a reduction in duct length for all other dryer elbows.
The Dryer-Ell is engineered for a one-to-one ratio with standard straight pipe.
The Dryer-Ell was specifically designed to minimize airflow friction loss.
The current building code from the International Code Council now also includes tables (IMC 504.6.4.1 and IRC M1502.4.4.1) that delineate an equivalent length for the Dryer-Ell that is the same as its actual length.
The bottom line: Dryer-Ells measure a one-to-one ratio with a straight pipe.
In certain run-length situations, the Dryer-Ell can eliminate the need for fans. This can simplify installation, remove a mechanical point of failure and eliminate maintenance problems.
Do We Really Need a Booster Fan? A booster fan is sometimes the only alternative because of the sheer distance required to exit the building. To place the dryer in very interior locations that require 45 to 60 feet of duct run to exit the structure, the DBF110 Booster Fan by Fantech is a viable option in some jurisdictions.
Lately, some local municipalities are shying away from the use of booster fans. Since the International Code Council has adopted the advantage of the Dryer-Ell's longer turn radius--see Building Code Whitepapers--there are some cases where the Dryer-Ell is an outstanding (and cost-saving) alternative to dryer booster fans. If the run requires elbows, the full allowable run length can still be used without a booster.