"Let’s clear the air with style. Blueair is the only line of air purifiers with a customizable, washable fabric pre-filter. Blueair genuine pre-filter replacement for Blue Pure 311i+ Max air purifier in Moss Green color is designed for optimal performance; Not compatible with Blue Pure 311i Max or 311 Auto

Our Scandinavian-inspired pre-filter colors including Fog Grey, Limestone Beige, Moss Green and Sand Pink are designed to seamlessly blend into your home. The fabric allows you to personalize the color to match your style, as well as extend the life of the primary filter, catching large airborne particles such as dust, lint, pollen, and pet hair. Vacuum the exterior of the fabric pre-filter to remove visible dust and dirt as often as you'd like. Removable, washable, and reusable, the Blueair genuine pre-filter is designed to be used again and again. When it requires a deeper clean, throw the fabric in the washing machine on a gentle, low-temperature cycle. Hang to dry.

*When similar CADR was measured, Blueair models with mechanical and electrostatic filtration achieved less noise with less energy than same models with only H13 HEPA mechanical filtration. "