Air Extractor Vents VK 125 Un with Regulator + Thermostat 355 m³/h (125mm) 4824032020647 | eBay
VENTS VK Series In-Line Centrifugal Type Fans User Manual - Manuals+
Amazon.com: VENTS-US VK 125 PS Dryer Booster Fan for 5 inch duct work with pressure sensor that automatically detects input from dryer and significantly reduces drying time : Appliances