Replacement for Aprilaire 401 (2Pack) Air Filter for Air Purifier Model 2400 Keep your Aprilaire Model 2400 air purifier working effectively with this 2pack replacement filter set designed as a direct substitute for the Aprilaire 401. These replacement filters restore filtration performance, help maintain airflow, and reduce airborne dust and common household particles so your purifier can continue to operate as intended. Key benefits Compatible replacement: Designed to fit and perform like the Aprilaire 401 filter in the Aprilaire Model 2400 air purifier. Readytoinstall 2pack: Two filters provide an immediate replacement and a spare for the next recommended change, simplifying maintenance. Improved indoor air quality: Helps capture dust, pollen, pet dander, and other common airborne particles to support a cleaner living environment. Maintains system performance: Restores proper filtration and airflow to help your Model 2400 continue to run efficiently. Main features and attributes Compatibility: Direct replacement for Aprilaire 401; specifically made for Aprilaire Model 2400 air purifiers. Quantity: Pack of 2 replacement filters. Construction: Made with pleated filtration media to increase surface area and maintain airflow (designed to match original filter specifications). Functionality: Removes airborne particles and helps protect the air purifier's internal components from dust buildup. Ease of use: Simple, tool installation; designed to drop into the same slot as the original Aprilaire 401 filter. Why you need it Regular filter replacement keeps your air purifier effective. A fresh filter ensures that the Model 2400 can capture airborne particles efficiently and maintain consistent airflow, which helps the unit operate quietly and reliably. Replacing worn filters prevents dust accumulation inside the purifier, reducing strain on the system and helping extend the life of your appliance. Having a twopack on hand means you can a filter promptly when needed and keep a spare for the next scheduled change. Use cases and applications Allergy relief: Use in bedrooms or living areas to reduce pollen and pet dander for household members with seasonal allergies or sensitivities. Home with pets: Place in common rooms to help capture pet hair and dander, improving overall air cleanliness and reducing visible dust. Office or small commercial spaces: Maintain cleaner air in work areas where dust and particulates can accumulate, helping to sustain a healthier environment for occupants. Installation and maintenance tips filters according to the schedule recommended for your Aprilaire Model 2400 or when you notice reduced airflow or increased dust. Turn off the unit before replacing the filter, remove the old filter, and insert the replacement so it seats fully in the filter compartment. Keep one filter from the 2pack as a ready spare to simplify future maintenance and avoid downtime. Reliable replacement for original equipment This 2pack replacement set is intended to match the fit and function of the Aprilaire 401 filter for the Aprilaire Model 2400 air purifier. If you own a Model 2400, these filters provide a practical, straightforward way to restore filtration performance and maintain cleaner indoor air.