The Metal Recessed Dryer Vent Box allows the dryer to be pushed up against the wall of the laundry room instead of having to be positioned 5 in. to 6 in. away in order to accommodate the dryer duct. The box also completely protects the duct from being crushed. When using this product lint build-up is minimized due to the limited kinks and bends.Made of steelTo be used in 2 in. x 4 in. or 2 in. x 6 in. wall applicationsCan be used with both gas and electric dryersIdeal for stacked washer/dryer applications