Soffit Baffles. AccuVent attic ventilation baffles are designed to keep insulation in place while directing a constant stream of airflow from soffit to ridge. According to the manufacturer, they're made from recycled flame-retardant PVC and meet the new EnergyStar Thermal Bypass Checklist requirements. They're sold in various sizes for both traditional and cathedral ceilings; prices start at about $1 per piece. Brentwood Industries, 610/376-1900, brentwoodindustries.com.