Filtrete Vacuum Belts Hoover Decade 48. Inventory box number 5666 Get maximum filtration with optimal airflow in your current vacuum system. Unlike fiberglass filters, Filtrete? Brand filters help protect your heating and cooling system and improve your indoor air quality by cleaning the air as it passes through the filter. Designed with exclusive 3-in-1 technology from 3M, Filtrete? air filters trap unwanted air particles while letting cleaner air flow through.