A chimney for medium-heat equipment must extend a minimum of how many feet higher than any portion of a building that is 25 ft tall?

For a chimney servicing medium-heat equipment, the design specification requires it to extend a minimum of 10 feet higher than any part of a building that is 25 feet tall. This height helps ensure proper ventilation and exhaust dispersion for the chimney.

When a vent or chimney is higher than the surrounding structure, it minimizes the risk of downdrafts that can cause harmful exhaust gases to enter the building and ensures that the emissions are effectively carried away from populated areas. The requirement for a 10-foot extension specifically addresses the safe operation of medium-heat equipment, which generates enough heat to necessitate careful handling of exhaust systems.

Other height parameters, such as those beyond 10 feet, may be applicable under different circumstances or equipment types, but for a medium-heat application in relation to a 25-foot building, the established standard is clearly set at 10 feet.