Cross Flow Ventilation

Sometimes louvers are installed in opposite gable ends, without intake venting, in the mistaken assumption that a good "crossflow" of air can provide adequate ventilation. What typically happens, however, as illustrated in Figures 16 and 17, wind direction is perpendicular to the ridge, the louvers act as both intake and exhaust vents, providing ventilation only in the areas near the vents. If the wind direction is parallel to the ridge, a crossflow of air is established, although the flow tends to dip toward the attic floor, leaving the hottest air still at the underside of the roof sheathing. Of course, if absolutely no intake venting can be installed at low points in the attic, a louver-only installation is preferable to no ventilation at all. Source: Air Vent Inc. A Certainteed Company Reprinted with permission, HouseNet, Inc.

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