EnviroCare Replacement Allergen Vacuum Bags for Hoover WindTunnel Type Y Uprights 6 Pack EnviroCare Replacement Vacuum Bag Compatible with 4010801Y / A856 / Style Y Includes 3 Bags per Pack. Filtration Type : Allergen with Closure Style: Y Captures The Following: - Mites - Pollen - Household Dust - And Other Particles