{"id":"net-free-area","license":"CC-BY-4.0","data":{"term":"net free area","shortDef":"The unobstructed opening area a vent still provides after mesh or a listed core. Fine mesh reduces it. Size vents so the attic still meets ventilation code.","alsoCalled":["NFA"],"relatedGlossary":["mesh","listed"],"relatedCategories":["vents"],"relatedGuides":["mesh-vs-listed-vents","net-free-area-after-mesh"],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z"}}