New construction can also mean remodeling. Basically there is no drywall on the studs. These Dryerboxes have a flange that mounts to the stud (in the rough) and is installed before the drywall is hung. These Dryerboxes have a "built-in" cornerbead, and do not need a secondary trim ring.
Introductory Video on larger new Model 480
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Celebrating 20 Years of Solving Common Dryer Venting Problems
The Better Venting Company
810 Saturn Street, Suite 19
Jupiter, FL 33477-4456