The Lomanco Vent Selector app allows you to easily calculate and share how many Lomanco roof vents you need for a properly balanced attic ventilation system. Find intake and exhaust options, roof pitch, Whirlybird® base pitches, and more with this multifunctional app. The Lomanco Vent Selector app includes: • Ventilation Calculator • Soffit Panel Tool • Whirlybird Pitch Tool Ventilation Calculator – Learn how many Lomanco intake and exhaust vents are needed for your installation. Soffit Pane