1. Why does this matter? It's not going in a window and the room is not sealed. The air purifier has multiple chances to filter air that has bypassed the filter

1. Why does this matter? It's not going in a window and the room is not sealed. The air purifier has multiple chances to filter air that has bypassed the filter the first time. 2. HEPA filters and various other filter media claim to filter viruses. So I think your recollection is incorrect. See: https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating-1 https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating-...