The Alen Air Filter B7-Prefilter is a set of one white flat panel prefilters designed for use with the BreatheSmart 75i air purifier. Made with a plastic filter frame and utilizing true HEPA filtration technology, these prefilters are specifically formulated for indoor air quality improvement. Manufactured in China, the Alen brand ensures quality and reliability in keeping your home clean and healthy. Perfect for maintaining a fresh and breathable environment, these prefilters are a convenient and effective solution for improving the air quality in your living space.