NFA - Net Free Area
Trimline Ridge Vent low profile (5/8") products offer a 12.7" Net Free Area per Lineal Foot.
Trimline Ridge Vent high profile (1") products offer a 19" Net Free Area per Lineal Foot.
Trimline Ridge Vent low profile (5/8") products offer a 12.7" Net Free Area per Lineal Foot.
Trimline Ridge Vent high profile (1") products offer a 19" Net Free Area per Lineal Foot.