Engineered to match the precise structural and dimensional requirements of Philips HU5930 and HU5931 air purifiers, this filter replacement guarantees a tight, gap – free fit. It perfectly fits into the filter compartment of these two Philips models, avoiding unfiltered air from bypassing the filter—a common issue with generic, ill – fitting replacements. Whether you own the HU5930 (with its focus on quiet operation for bedrooms) or the HU5931 (designed for efficient room coverage), this FY1114/FY1110 filter ensures your device operates at the same optimal efficiency as when using the official Philips original filter.