How do I install a balanced ridge vent system?

After installing the ridge vent make sure the remaining 50% of attic airflow is intake ventilation.

A balanced system of attic ventilation means 50% intake and 50% exhaust airflow through the attic. This is the best way to create effective, year-round ventilation. Thus, in addition to installing ridge vents, which act as exhaust vents, be sure your attic has intake vents either low at the roof's edge or in the soffit/eaves. To ensure a balanced ventilation system, match the amount of net free area the ridge vent provides with as much, or more, intake area. To do so, measure the length of ridge vent you will be installing, then double that length for Air Vent's The Edge™ Vent, ProFlow Vented Drip Edge or continuous soffit vents because the net free area (NFA) of each of those intake vents is 9" and the NFA of the ridge vent is 18". There are other intake vent options as well. The key is 50% intake and 50% exhaust.