Xpelair WX9 is a ventilation fan designed for installation in windows or panels. It features a double pole isolating switch for safe electrical connections and maintenance. The fan is suitable for panels with a thickness of at least 4mm. Xpelair offers a 3-year guarantee against defects from the date of purchase, with the option to repair or replace at their discretion. The company also provides a range of services such as free technical advice and design consultations.