The 4 Packs FLT4825 HEPA Filter B Replacement is a high-quality air purifier filter designed to last for 6 months. Made with carbon fiber filter media and featuring 8 carbon pre filters, this true HEPA filter effectively captures airborne particles to improve indoor air quality. The black filter frame is made of durable plastic and each pack includes 4 filters, providing a reliable filtration solution for your home. Designed for use with the Guardian AC4825 model, this HEPA filter is a practical and efficient choice for maintaining clean and fresh air in your living space.