The Dryer Box® 350 Recessed Dryer Vent Box (# DB-350， DB350， 10-2003)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>* Designed for upward exhaust direction</li><li>* 22 gauge aluminized steel weighing 4.03 pounds each</li><li>* Top port measures 4 7/8" x 3 1/8" oval shape</li><li>* Distance from nailing flange to rear of box is 3 1/2"</li><li>* Overall measurements: 21" h x 12 1/2" w x 4 3/8" deep</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41SS-4HeVfL.jpg" noproxy>