If a stack penetrates the roof 7 feet from a firewall, what must be done?

The correct answer emphasizes that as long as the vent terminal is at least 12 inches above the roof, no additional action regarding its distance from the firewall is necessary. This provision in the plumbing code helps ensure proper ventilation while minimizing risks associated with exhaust fumes or hazardous gases from being trapped or concentrated near a structure. The height requirement effectively addresses concerns related to building safety and air quality, which are critical for maintaining a safe environment.

It's important to recognize that while distance from the firewall can be a concern, the primary stipulation is the height above the roof. Vent terminals that are appropriately elevated help in mitigating the risk of backdrafts or the obstruction of vented gases, addressing both functionality and compliance with safety standards.