The world-renowned Windsor Sensor has been the staple in the hospitality industry for decades. Replace your filters regularly to maintain peak performance and protect the warranty of your machine. Don't forget, the Sensor vacuum has two filters (micro & exhaust). Change them both every 20 bag changes, or 6 months (whichever comes first). Our Windsor Sensor Service Boxes will not only save you money, they will give you just the right number of bags to last you between the filter changes (included in the service box). HomePro's all-new deluxe service boxes include the other wear items needed to keep your machine running like new & save you even more money!