The Hoover 40110001 is currently on backorder from the manufacturer until mid-December 2013.
The 40110001 is the correct replacement filter for the following models:
The Hoover Final Filter for WindTunnel Self-Propelled is a replacement filter for the Hoover self-propelled WindTunnel upright vacuum cleaners with the Hoover allergen filtration system. This high efficiency filter is pleated and features a hard-frame that makes the Hoover WindTunnel an efficient cleaning tool.
This Hoover filter, also known by model number 40110001, is easy to install as it fits inside the filter door of your Hoover self-propelled upright Hoover WindTunnel vacuum cleaner. With this final filter you will be able to clean your carpets with ease and maintain a comfortable living atmosphere.
Hoover Final Filter for WindTunnel Self-Propelled specifications: