Lomanco Air Flow Meters

Overview

The LOMANCO 750BR is an 8-inch brown aluminum slant-back roof louver designed for passive attic ventilation in residential roofing applications. The unit features a weather-tight seamed collar that seals against moisture intrusion at the deck penetration. A large nailing flange simplifies attachment to the roof deck and helps create a secure, low-profile installation. The three-sided louver design increases the effective air intake area compared to standard two-sided louvers, improving passive airflow through the attic cavity. Overall dimensions measure 16 inches by 20.3125 inches by 5 inches, with an 8-inch opening size. The brown aluminum finish reduces the risk of roof discoloration around the vent over time. This louver is suited for sloped residential roofs where continuous ridge ventilation is not used or where supplemental point ventilation is needed. It is commonly installed in attic spaces to exhaust trapped heat and moisture buildup, which can degrade roof deck sheathing and insulation. Roofers and general contractors typically install this unit during new construction or re-roofing projects. The slant-back profile sheds water away from the opening and maintains a low visual footprint on the roof surface. Key Features 8-inch opening size suits standard roof deck cutouts for residential attic exhaust Three-sided louver configuration increases airflow compared to two-sided designs Weather-tight seamed collar resists moisture intrusion at the deck penetration Large…