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For Hoover HEPA Exhaust filter cartridge designed to fit the Hoover Windtunnel Air UH70400. This is a bundle set of replacement HEPA filter cartridges for the Hoover Windtunnel Air Lightweight Upright model UH70400. These filters are located directly underneath of the dirt cup assembly. It's very important that these filters not get wet in any way. Hoover recommends to remove the filter every 30 days, and tap it against the side of your trash can to remove any debris. This is a very durable filter, and should only need replacing every 2-3 years, unless you, or someone in your home suffers from breathing issues such as asthma, or has allergies. The more often this filter is replaced, the better airflow your motor will have, prolonging the life of your motor with increased filter replacements. Hoover HEPA Filter Cartridge, Fits Part Number 303902001. Fits Hoover Windtunnel Air Model UH70400. Generic aftermarket filters made by DVC Micro-Lined. 100% Full Satisfaction Guarantee. If you're not 100% entirely satisfied with the size, fit or quality of these filters, please just let us know, and we'll immediately send you a pre-paid return shipping label you may use to return the filters to us (within 30 days of your purchase) for a full, 100% refund.