What it does: Replacement cotton filters designed to trap dust and debris before they reach the fan and ductwork, helping maintain airflow, reduce noise from dust buildup, and keep bathroom air cleaner. Compatibility: Made specifically for models F LF/5, fan LF/ELF, and the conversion kit F/C. Designed for a snug fit with a 95 mm center hole to ensure proper seating and reliable performance. Size and fit: Precise dimensions 226 x 226 x 18 mm with a 95 mm center hole. Use these exact measurements to confirm fit before purchase. Material and durability: Constructed from cotton for dependable filtration and resilience in humid bathroom environments. The cotton media balances airflow with particle capture and is robust for routine replacement cycles. Filtration performance: G4-rated filtration traps larger dust and lint particles that commonly accumulate in bathroom fans. By capturing these particles, the filter helps maintain fan efficiency and reduce mechanical noise caused by buildup. Maintenance benefits: Installing a filter reduces the frequency and difficulty of deep cleaning fan housings and ducts, and can help extend the service life of the fan motor by preventing particulate buildup. Simple installation and replacement: Thin profile (18 mm) and the 95 mm center hole make alignment and installation quick when replacing worn filters or servicing the fan. Typical use scenarios 1) Routine maintenance for a residential bathroom exhaust fan (models F LF/5 or LF/ELF): Replace the filter during regular cleaning intervals to keep airflow efficient and reduce humidity-related odors. 2) After converting or upgrading a fan using conversion kit F/C: Fit the correct filter to protect the new configuration and ensure the conversion runs quietly and efficiently. 3) High-use bathrooms or small commercial restrooms: Use these filters to cut down on dust accumulation and lower the frequency of professional cleaning or repairs. Specifications summary Compatible models: F LF/5, fan LF/ELF, conversion kit F/C Center hole diameter: 95 mm Dimensions: 226 x 226 x 18 mm Material: Cotton Filtration rating: G4 Choose these filters when you need a direct-fit, durable G4 cotton filter that preserves fan performance, lowers maintenance, and helps keep bathroom air cleaner.