Honeywell PopUp1625 media filter

• Reduces the installation time of replacement
• Fiberglass-free filtration
• Quick, easy maintenance
• Higher efficiency air filtration with larger area
• Six sizes available for Honeywell and various MACs

I could not find these filters at Lowe's or Home Depot or any other hardware store. Does anyone know how to tell when to change these filters? How grey do they have to be?

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