Keep your indoor air clean and fresh with the Core 300-RF Replacement Filter. This air purifier replacement filter is designed to fit perfectly into your Core 300-RF unit, providing optimal performance and protection against pet allergens. The filter is available in a bright yellow color and comes in a pack of 2 units, ensuring that you always have a spare on hand. The Core 300-RF Replacement Filter is ideal for anyone who wants to keep their home or office environment healthy and free from allergens. With its high-quality construction and reliable performance, this air purifier replacement filter is the perfect choice for anyone who wants to breathe clean and fresh air. Get yours today and enjoy a healthier, more comfortable living space!