Ceramic fiber products can affect indoor air quality in several ways. They are generally considered safe when used properly and are non-combustible, which means they do not contribute to the production of smoke or toxic fumes. However, if the fibers become airborne, they can potentially cause respiratory issues, especially for those with pre-existing conditions. It's important to ensure that ceramic fiber products are well-maintained and not damaged, as this can reduce the risk of fiber release. Proper ventilation can also help to minimize any potential impact on indoor air quality.