The Venmar HEPA replacement filter will purify the air in your home and keep your air filter running effectively. Designed for HF 3.0 and HF 3.1 models, this Venmar HEPA 3000 filter is considered one of the most efficient on the market. It captures 99.97% of airborne particles in your home, including those as small as 0.3 microns. This effective air filter helps keeps your home dust and allergen free. Make sure you replace it every year for best results.