How high must venting extend through a roof?

Venting must extend through the roof to a height that ensures the effective dispersion of exhaust gases and prevents the possibility of harmful fumes re-entering the living space. The standard requirement in many building codes is for venting to extend at least 24 inches above the roof surface. This height ensures that the vent is above the roofline, minimizing the chances of wind-driven snow, rain, or other obstructions interfering with the proper function of the vent.

In addition, this height helps maintain adequate clearance from potential obstructions such as buildings and trees, which might affect the vent's exhaust performance. Adequate height compliance is essential to avoid negative pressure scenarios and ensure that the venting system operates effectively and safely.