Sheet Metal Dryer Vent Box; Item Dryer Vent Box; Type Oval Top; Size 16-3/4 Inch Width x 4-3/8 Inch Depth x 19 Inch Height; Material Thickness 22 Gauge; Material Aluminized Steel; Used On Item Dryer Vent; Wall Size 2 Inch x 4 Inch; Top Port Size 4-5/16 Inch x 3-7/8 Inch; Nailing Flange to Rear of Box Size 3-1/2 Inch; Exhaust Direction Downward; Approval UL (Canada and US)