If you own this Vornado air purifier try buying bulk roll carbon pre-filters and add them to this filter. Cut them to size and put them on the intake side of the filter on the inside of the unit. You can tape them in if you want but I don't. This trick will increase the efficiency of the unit (remove more stuff) and will make these grossly over priced filters last longer. I checked the fan motor for increased heat and there was none so this is a safe and highly recommended mod.Save 34% Off
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