The Marathon 4-inch Aluminum Insulvent is a one-way or two-way vent that provides pressure equalization in the roof system. It is spun from heavy gauge aluminum with a unique cap design that shields against entry of wind-blow rain or snow. It is...
The Marathon 4-inch Aluminum Insulvent is a one-way or two-way vent that provides pressure equalization in the roof system. It is spun from heavy gauge aluminum with a unique cap design that shields against entry of wind-blow rain or snow. It is...