The porcine reproductive and respiratory syndrome (PRRS) virus has been proven to spread through the air. The most proven way to stop this aerosol spreading of the virus is to install HEPA filters where air enters the barn. Although this method is effect it can also be costly. This report evaluates effective inexpensive alternatives to stoping the PRRS virus. Pigs were held in a recipient chamber where air was filtered into by a fan from the first chamber. The air was PRRS positive and was misted in to the  first chamber. The low costs filter being tested (control) was made of mosquito netting, 2 fiberglass furnace filters and 2 electrostatic furnace filters. The HEPA filtration system utilized a pre-filter screen, a bag filter and a HEPA filter. The bag filtration system involved the use of a MERV 14 rated filter. The 95% DOP @ 0.3 μm filtration system involved a pleat-in-pleat V-bank disposable filter having a 95% DOP efficiency rating at particles > 0.3 μm. Aerosol transmission of PRRSV occurred in 10/10 replicates (control), 0/10 replicates (95% DOP @ 0.3 μm filtration), 4/10 replicates (2x-low cost filtration) and 0/10 replicates (HEPA filtration). The HEPA filter seems to be the most effective method for stopping the spreading of PRRS although the 95% DOP maybe a more cost efficient method.