The DVB425 is a 4-1/4" deep recessed dryer vent box manufactured by Southwark Metal MFG Co. Here are the key details:
Type: Deep recessed dryer vent box
Depth: 4-1/4 inches
Material: Aluminum
Gauge: 22 GA
Flanged: Yes
Galvanized: Yes
Dimensions (H × W × D): 21" × 12.5" × 5.125"
Weight: 4.14 lbs