Besides not being directly beneath a door, openable window, or air intake, a side-wall (through-wall) vent termination must also maintain required clearance from…

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A through-wall vent terminal must keep the code-required distances from building openings and the property/lot line so sewer gas does not drift back indoors or onto a neighbor's lot. Through-wall terminations are also protected against birds and rodents with a screen or cap. Roof termination is preferred where a through-wall vent cannot meet the clearances.