How high must subslab soil exhaust system ducts terminate above the roof?

In the context of subslab soil exhaust system ducts, it is important to ensure proper ventilation to prevent the accumulation of potentially harmful gases or vapors. These ducts are designed to transport gases from beneath the building slab to the outside atmosphere, where they can safely disperse.

The correct termination height for these ducts above the roof is specified to ensure that the gases are adequately vented away from building openings, such as windows or air intakes, which could otherwise allow hazardous substances to re-enter the building. Terminating the exhaust ducts at a height of 6 inches above the roof provides a balance between effective venting and minimizing the risk of backdrafting or re-entry of gases into the structure.

This height requirement is typically informed by safety levels and effective emission dispersal to avoid any health risks associated with inhaled contaminants from the subslab. Proper installation and adherence to these guidelines are crucial in any mechanical or ventilation systems to maintain a safe living environment.