J Grotz TVWBB Wizard Sep 15, 2020 #1 20" box fan plus a MERV 13 or 14 filter and you're in business. https://www.lowes.com/pd/Filtrete-C...n-Electrostatic-Pleated-Air-Filter/1000420743 Last edited: Sep 15, 2020
20" box fan plus a MERV 13 or 14 filter and you're in business. https://www.lowes.com/pd/Filtrete-C...n-Electrostatic-Pleated-Air-Filter/1000420743
