For anyone wanting air cleaners to deal with #Wildfire #Smoke this Summer, the best #MERV13 filters for assembling a #CRBox / #CorsiRosenthalBox are on a great sale at Costco through Monday June 26th: $45 for a 4-pack of any size.
https://www.costco.com/3m-2200-series-filtrete-1%22-filter%2c-4-pack.product.100337928.html