The Lomanco Omni Pro Shingle Over Ridge Vent is an exhaust vent that will help eliminate your attic of damaging heat and moisture, when it is properly installed and used in conjunction with intake vents located near the lower part of the attic space. It has a sonic welded fiberglass screen that provides maximum weather protection, offering internal aerodynamic curved baffles with external perpendicular omni baffles. Omni Pro from Lomanco has an external water shield, six drain holes per side per foot, and meets or exceeds residential attic ventilation codes. FeaturesIncludes 2-1/2in. ring shank nails, 30 nails per piecePosi-tabs contour to shingles for improved weather protectionWeatherproof underlapping joints18 square inches of Net Free Area per linear foot10 supported nail holesMolded-in shingle nail lines, reinforced every 2 inchesSlot width guide linesContinuous molded end plug for improved weather protection SpecificationsOverall Width Per Piece: 14-1/2in.Length Per Piece: 4ft.Weight per Piece: 1.8 lbs.Carton Weight: 18 lbs.Net Free Area (NFA) per Square Inch: 72Preformed to a 2/12 pitch and fits roof pitches ranging from 2/12 to 16/12Uses a 12in. cap shingleLifetime Limited Warranty