Universal Tumble Dryer Condenser Vent Kit Box with 4inch/102mm Diameter Hose for indoor use by Hume Premium (1 meter hose length, Adapters to fit most models) : Amazon.co.uk: Large Appliances
Lambro 17.25-in x 23-in Plastic Dryer Vent Box in the Dryer Vent Boxes department at Lowes.com
Maximex 3743010500 Tumble Dryer Condenser : Amazon.co.uk: Large Appliances
BetterMethods - Dryer Box — Rautmann Custom Homes
Dryer Vent Boxes at Lowes.com
Buy Wpro Universal Tumble Dryer Condenser Converter Box - White | Large kitchen appliance accessories | Argos