As you might suspect, many of these air filters are the same, they just have different branding stickers or slightly different characteristics. The Rikon 400 air filters listed are significantly more expensive than these, but they fit almost perfectly. I think there was a 2mm difference on one of the sizes, which wasn't enough to worry about the filter bag behind it. So if you have a Rikon device and want to save money, this is your best choice. I'll stock up on a few as I use a lot of air filters.
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