November 10, 2022November 10, 2022 by johnshouseimprovement Bookmark Bad Vents on Roof -see them on a real Jobsite These plastic vents are called PRV-50, they don’t make it anymore—They are notoriously bad. When you know these PRV-50 Vents, you’re gonna get them off of your roof immediately and replace them with a metal vent that will last 30 to 40 years Share this:TwitterFacebookLike this:Like Loading...