Kansas Mechanical Journeyman Complete Practice Test 2025

The requirement for the height of a gas vent, particularly when it is adjacent to vertical walls, is critical for ensuring proper venting and preventing hazardous conditions. When a gas vent protrudes through a roof and is located within 8 feet of a vertical wall, it must extend sufficiently above the highest point of the roof to minimize the risk of exhaust gases re-entering the building or creating a dangerous situation.

In this case, the minimum required height above the highest point of the roof for the gas vent is 2 feet. This requirement is grounded in safety practices and building codes to allow for effective dispersion of exhaust gases. By maintaining this height, it helps ensure that the venting system operates efficiently, reducing the risk of any backdrafts that could affect air quality within the property.

Choosing a height of less than 2 feet could compromise the vent's effectiveness and pose safety risks, while a height of 2 feet appropriately meets the code requirements for installations near vertical structures.