C545 True HEPA Replacement Filter 4 Pack - Compatible with Winix C545

In this review of the C545 True HEPA Replacement Filter 4 pack, the bottom line is straightforward: it is a cost-effective option for owners of compatible Winix models who need reliable particle capture and easy swaps. Designed as a replacement for Winix S Filter and comparable to part numbers 1712-0096-00 and 2522-0058-00, this non-OEM set focuses on filtration efficiency, quieter operation and a longer service life thanks to upgraded electrostatic electret technology. For households wanting improved air quality without the premium price of OEM parts, this pack delivers sensible performance and simple installation.

Key Features

• Compatibility: Fits Winix C545, B151, P150 and 9300 units, so users can replace old filters without modifying the purifier.
• True HEPA capture: Claims to remove 99.7% of particles down to 0.3 microns, helping with dust, pollen and pet dander in indoor spaces.
• Electrostatic electret layer: The upgraded electret filter reduces energy use and extends filter life while maintaining filtration efficiency.
• Lower resistance design: Premium non-woven fabric and a lower density structure aim to reduce pressure on the fan for quieter operation.
• Value pack: Four filters in one package provide multiple replacements and a cost-effective schedule for 6-12 month changes.
• Easy installation: Filters are tool-free and simply swap into the machine for routine maintenance.

Who It's For

This 4 pack is best for owners of Winix C545, B151, P150 or 9300 purifiers who want an affordable, multi-pack replacement that matches the fit and basic performance of OEM S filters. It suits households managing seasonal allergies, pet dander or general dust who replace filters on a regular 6-12 month cycle.

Those who need exact OEM materials for warranty reasons or who are sensitive to chemical odors should look elsewhere, since customers have reported a noticeable chemical smell on new filters and that the carbon layer is thinner than some original parts.

Pros & Cons

Pros

• Good particle removal for common indoor pollutants and allergens.
• Four filters per pack makes regular replacement convenient and economical.
• Easy, tool-free installation and a design that reduces fan noise.
• Upgraded electret layer aims to extend service life and lower energy use.

Cons

• Not an OEM product, and some users notice a chemical smell when new.
• The activated carbon layer is reported to be thinner than previous versions, which may reduce odor removal compared with some originals.

Specifications

Our Verdict

The Funmit C545 True HEPA 4 pack is a practical, value-oriented replacement for compatible Winix models that balances effective particle filtration with lower running noise and easy installation. It is a good buy for users who prioritize cost and convenience, but buyers who need the strongest activated carbon performance or zero off-gassing should test a filter on arrival and consider OEM alternatives if sensitivity is an issue.

Frequently Asked Questions

Are these filters genuine Winix parts?
These are aftermarket filters made by Funmit and are not OEM; they are sold as compatible replacements.

How often should I replace the filter?
Funmit recommends replacing the HEPA filter every 6-12 months depending on usage and air quality.

Do the filters remove odors?
The filters include a carbon layer for odor reduction, but customers note the carbon layer is thinner than some originals, so results may vary.