Those Honeywell room filters for sickroom or allergy sufferers work pretty well to reduce dust or pollen... I have an old one from a thrift store that I have used while cleaning very dusty rooms (that made me cry and sneeze), and overnight cleared the air...
I think the unit new is around 50 or 75 bucks (from big box stores and pharmacies), but replacement filters are not cheap... Worth looking into...
Steve K
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