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Ridge vents shingle over coil exhaust vent cobra wdth ins x lgth 10.5 feet x 20 Use on roof pitches from 3/12 to 20/12. Helps remove excess heat and moisture to protect against premature roof deterioration and helps prevent problems with birds insects and animals in attic. Prevents roof rot in attic or roof deck. Minimizes peeling a nd extends the life of exterior and interior paint. Limits mold growth. Easy to install shingle over design is virtually invisible when installed. Includes Smart Nails for hand-nailing or 1- 3/4 inches coil nails for nail guns. Meets or exceeds all code requ irements. 16.9 sq. ins. per linear foot of net free ventilating area when hand-nailed. 14.1 sq. ins. per linear foot of net free ventilating area when using nail gun. Will not crack or dent during installation. Won’t corrode rust or turnbrittle. Works with traditional size ridge cap shingles.