Patented Model R with Magnetic Attachment By Gayle Posted January 3, 2022 In 1 0 The PreVent® Model R with Magnetic Attachment is patented. Recent PostsThirteen Years of PreVent Air Filtration Excellence: A Science Lab Success StoryCustom Air Filter Insights: A Conversation with Plant Operations Manager Roy MontemayorEZ In, EZ Out: Why Installing and Removing Air Filter Screens from Hard-to-Reach Areas is EasyMetal Mesh vs. PreVent Prefilter: Which Works Better with Cottonwood Seedlings?