Installation Details · FAQ

Is ridge vent always better than box vents?

For ventilation performance, yes — by a meaningful margin. A continuous ridge vent moves air across the entire roof surface evenly. Box vents (typically 12×18 inch dome vents on the roof slope) create pressure pockets where they’re installed and dead zones in between. The same total net free area in box vents delivers about 60 to 70% of the airflow of continuous ridge vent.

Box vents do have one advantage: they work on roofs without a usable ridge line (gable-style hip roofs, roofs with multiple short ridges). On those structures Trill installs box vents in the calculated quantity and spacing for full coverage. For a standard two-slope gable roof, ridge vent is the better choice 100% of the time.