These Mirco-filtration vacuum bags are 30% more efficient than the standard paper bags. They are designed to keep 99.7% of all dust .5 microns and larger in the vacuum bag. These are comparable with Hoover's Allergen Style bag, part number 4010100Y. These bags have a unique Dust Window in them, which is a clear strip in the middle of the bag that allows you to see how full the bag is getting. These bags fit the following Hoover model numbers;U5140-900-U5154-900;U5301-9RM-U5399-900; U5402-900-U5477-900;U5720-9000-U5780-900U6401-9R M-U6474-900;U6607-900-U6632-900;
| | Generic Hoover WindTunnel Type Y Vacuum Bags 9 Pack, Fits Hoover 4010100Y |  | 9.64 |  |
