Blueair 400 Series Replacement Particle Filter

Why polypropylene? Because it is one of the least harmful plastics for human health and the environment,  does not release any gas elements, and does not release any irritating microscopic fibers into the air.

Also, this type of fiber eliminates bacteria, viruses and mold naturally, without chemical additives also captures more dirt than competitive systems. The used filter media also decomposes into harmless carbon dioxide and water, a very environmentally friendly feature.

Particles that a normal HEPA filter alone might miss are captured with an electrostatic charge. HEPASilent™ technology moves particles through an enclosed ion chamber, which attaches a charge to the particle itself. Charged particles cling more easily to the filter media, resulting in higher filter efficiency overall. Because most electrostatic air cleaners charge the filter media itself, the charge dissipates over time and renders the filter less efficient. By constantly charging incoming particles, instead of the filter, HEPASilent™ technology keeps on working effectively and reliably.  Very important for those with allergies.