These bags are made to fit Hoover Type Y Vacuum bags, and fit all Hoover Windtunnel Uprights, and Hoover Tempo upright models. Envirocare brand are Micro filtration construction, and are excellent at capturing dust mites, viruses, bacteria, animal dander, and other allergens. These bags compare to Hoover's upgraded Allergen filtration bag, part # 4010100Y. Hoover Y bags fit the following upright models; U5140-900; U5142-900; U5144-900; U5145-900; U5148-900; U5154-900; U5301-9RM;; U5330-900 U5330-900; U5393-900; U5394-900; U5395-900; U5395-940; U5395-960; U5395-970; U5396-900; U5396-960; U5397-900; U5398-900; U5398-990; U5399-900; U5402-900; U5403-900l; U5409-900 U5415-900; U5416-900; U5420-900; U5423-900; U5432-900; U5433-900; U5434-900; U5435-900; U5436-950; U5437-960; U5438-900; U5439-900; U5443-900; U5444-900; U5445-900;U5446-900; U5447-900; U5449-940; U5450-900; U5451-900; U5452-900; U5453-900; U5454-900; U5456-900; U5457-900; U5460-900
U5461-900;
U5462-900;
U5463-960;
U5464-900;
U5465-900;
U5465-960;
U5465-970;
U5465-990;
U5468-900;;
U5469-900;
U5469-910;
U5470-900;
U5475-900;
U5475-960;
U5477-900;
U5720-900;
U5720-960;
U5720-990;
U5721-900;
U5722-900;
U5740-900;
U5750-900;
U5750-980;
U5751-900;
U5752-900;
U5753-960;
U5755-900;
U5757-900;
U5758-900;
U5759-900;
U5760-900;
U5761-900;
U5762-900;
U5780-900;
U6401-9RM;
U6423-900;
U6425-900;
U6425-920;
U6429-900;
U6429-900;
U6430-900;
U6430-900;
U6431-900;
U6432-900;
U6432-900;
U6433-900;
U6433-900;
U6434-900;
U6435-900;
U6435-900;
U6436-900;
U6436-900;
U6437-900;
U6437-900;
U6439-900;
U6441-900;
U6441-940;
U6445-900;
U6445-920;
U6446-900;
U6446-930;
U6449-900;
U6450-900;
U6451-900;
U6451-960;
U6453-900;
U6454-900;
U6455-900;
U6455-960;
U6458-900;
U6459-900;
U6459-900;
U6460-900;
U6470-900;
U6470-910;
U6471-900;
U6473-900;
U6474-900;
U6607-900;
U6616-900;
U6617-900;
U6618-900;
U6626-900;
U6632-900;
