Heating & Air Conditioning Units (HVAC) Used to Spread COVID !!!

He alleges that the CDC sent wrong settings for HVAC units to hospitals, schools, jails, office buildings, medical clinics, dental offices ... !!! This engineer explains how COVID was spread through many HVAC units, and how new viruses could may currently be introduced in the same way. Have the settings checked on your HVAC units by a professional like this engineer!