Amazon.com: DBX1000M Metal Dryer Vent Box With Snap on Trim Ring | Dryer Box | Recessed Dryer Vent Box | Dryer Vent | Up or Down venting & More | 2x4" : Appliances
Lambro 17.25-in x 23-in Plastic Dryer Vent Box in the Dryer Vent Boxes department at Lowes.com