The Hip Ridge Vent should never be used on buildings with an overall width (eave to eave measured horizontally) greater than 50 feet. The net free area (12″) will drop below the 1/300 ventilation requirement of building codes when widths exceed 50 feet. Greater building widths may be accommodated by using the Hip Ridge Vent in conjunction with ShingleVent II on all available peak (horizontal) ridges on the same structure. Please refer to the online calculator to verify prior to construction.