Lomanco 770D (Twin 770) All-Aluminum Off Ridge Vent (Largest Version) Carton of 4

The Lomanco 770D is a twin 770 off-ridge vent. An off-ridge vent is placed a certain distance off the roof ridge that allows air to circulate the attic without compromising the weather proofing of the vent. . The 700 series slant back vents are also approved by Texas Department of Insurance "Windstorm" to withstand variable wind speeds. The slant back is designed to prevent roofing discoloration that might occur over the life of your roof. The 770D offers two 9 1/2 inch opening to move air effectively from an attic outside. The Lomanco static vents are designed to be installed on various roof pitches and feature a large flange for easy installation.