Lowe's sells dryer vent boxes in multiple sizes, as of 2015. A dryer vent box is designed to fit into an opening in the wall, allowing a user to push a dryer flush against the wall without crushing the venting duct.
Crushed venting ducts are a potential fire hazard because they trap lint. Crushed ducts also increase drying time because air flow is restricted, so vent boxes often improve energy efficiency. The boxes at Lowe's have a single hole for the dryer duct, and the boxes can be installed to direct the vent upward or downward. The Imperial 11.75-inch dryer box can also be painted to match the wall.