it is important that you change the filter every 6 months

Replaced part number 20937

Hoover WindTunnel Self-Propelled Ultra Bagged Upright U6434900

or else replace your HEPASilent filter with the hybrid SmokeStop filter to get a single filter that captures airborne particles and blocks gaseous particles and odors

Additionally

Hoover Style B Allergen Filtration Commercial Upright Bags, 3 Pack Dyson DC26 Vacuum Parts it is important that you[custom_html] Designed to help you win the war on indoor allergens, these genuine Hoover Type B Allergen Filtration vacuum bags are used in a number of upright and commercial Hoover vacuum series. These bags are specially designed to target pollen, mold and fungal spores, dander, micro fine dust, and other common indoor allergens. Help improve your indoor air quality with genuine Hoover Type B Allergen Filtration vacuum bags for Hoover Commercial