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UL: DIY box fan filters are probably safe
b"You've seen the formula: 20 inch box fan ($30) + 20 inch furnace filter ($10) + duct tape ($5) = a quick, effective, DIY home air purifier for under $50. How effective are they? I measured my home..."
Big Brothers Big Sisters
Listed under: Education Families & Children
Meets first and third Tuesday of each month at 7:30pm
