Deflecto 4" Oval Duct, Adjustable from 18" to 31" (DAF1) 18" x 31" adjustable oval duct Made with sturdy, aluminum metal Allows dryer installation as little as 3" from the wall Pipe can conveniently be cut to shorter lengths Prevents duct from being smashed behind dryer Allows for dryer installation as little as 3 in. from wall Adjustable 18 in.-31 in., can be cut to shorter lengths Vertical, horizontal, or diagonal installation All aluminum fire resistant ducting