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.