Python™ Weather-Tite™ Rolled Ridge Vent Our recycled plastic, single-layer ridge vent can be used under shingle ridge caps to keep attics cooler and dryer in all seasons. Python™ FlexFit™ 3-in-1 Ridge Vent The most innovative, field-adjustable ridge vent on the market converts from 12" to 10" or 9" ridge vent size by simply scoring the groove on the top of the vent. Python™ Weather-Tite™ FlexFit™ 3-in-1 Ridge Vent All the advantages of our FlexFit™ 3-in-1 Ridge Vent plus a non-clogging weather barrier to provide a superior Net Free Venting Area while blocking out moisture, pests, and dust. Python™ 65 Slant Back Vent This patented, no-break polypropylene solution can be used as an intake or exhaust vent and features a high Net Free Venting Area of 65 plus a dent-free, low-profile design for greater curb appeal. Python™ 150 Round Vent With 150 square inches of Net Free Venting Area, this no-rust/no-dent no-break polypropylene solution requires only a third of the roof penetrations of typical 50 NFVA vents, saving time and money. Resources Dig deep with technical tools, reference charts, installation videos and more. Ventilation Calculator Frequently Asked Questions Ventilation Roofing Glossary News Keep up to date with the latest news and info from Marco and around the industry.