Now that spring is here squirrels and raccoons become more active

Often rodents will try to gain access into your attic thru roof vents. The best way to deter rodents from entering thru your vent is to install a metal cage over the existing vent. Most vents are made from extruded plastic so it’s not fully protected from rodents. You can find metal vent cages at suppliers like Spar listed below.

Source: Sparmarathon.com