When a roof jack, ventilator, or gooseneck is longer than what measurement, you require a curb that is 12 inches in size?

In HVAC applications, particularly when installing roof jacks, ventilators, or goosenecks, the length of these components plays a crucial role in determining whether additional support, such as a curb, is necessary for effective installation. A curb is important for ensuring proper alignment and sealing, which helps prevent leaks and enhances the overall performance of the HVAC system.

When the roof jack, ventilator, or gooseneck exceeds a specific measurement—in this case, 10 inches—it is essential to utilize a curb that measures 12 inches. This serves as a guideline to provide adequate support and elevation, which is particularly important in flat roofing systems where water drainage and roof integrity are critical.

A curb of this size assists in managing the height of the installation above the roof surface, promoting better water runoff and minimizing the risk of water pooling, which can lead to further issues, including damage to the HVAC components or the roofing material. By adhering to this measurement, contractors can ensure that their installations meet industry standards for safety and functionality.