Lomanco Vent Calculator
Lomanco Vent Calculator – Calculate Your Attic Ventilation Needs Lomanco Vent Calculator Determine the required Net Free Area (NFA) for balanced attic ventilation. Ventilation Calculator Attic Floor Area (sq ft): Enter the total square footage of your attic floor area. Ventilation Rule: 1/300 (Standard) 1/150 (With Vapor Barrier/Low Slope) Select 1/300 for most attics, or … Read more