2 Packs Pre-Filter Replacement Cover Compatible with 511i Air Purifi-er, Washable Fabric

["【𝗣𝗲𝗿𝗳𝗲𝗰𝘁𝗹𝘆 𝗖𝗼𝗺𝗽𝗮𝘁𝗶𝗯𝗹𝗲 𝘄𝗶𝘁𝗵 𝟱𝟭𝟭𝗶 】These 511i Max replacement filters are only compatible with 𝟱𝟭𝟭𝗶 Air Purifi-er. Not fit for other models. Please check your model before placing an order.","【Easy to Install】Simply take off the older and dirty fabric pre-filter and replace it with a new one. Vacuum the fabric or toss it in the washing machine whenever it needs cleaning.","【Value for Money】Incluing 2 packs high quality pre-filters at low cost for long time usage","【First Line of Defense】Our cover is the outermost layer of your machine and effectively trap larger particles such as pet dander, hair and lint, extending the life of the inner filter","【Warm Tip】We recommend to replace the pre-filter every 3-6 months depending on using frequency"]