Final answer:
Masonry chimneys should extend at least 3 feet higher than any portion of a building within 10 horizontal feet to comply with safety standards and ensure efficient operation.
Step-by-step explanation:
The subject of the question falls under the category of Engineering, more specifically regarding building and safety standards related to the construction of masonry chimneys. It involves understanding the safety measures that should be in place to ensure chimneys are built at an adequate height relative to the rest of the building to operate safely and efficiently.
Masonry chimneys should extend at least 3 feet higher than any portion of a building within 10 horizontal feet. This rule is part of the safety codes designed to prevent potential fire hazards and ensure proper dispersion of smoke and gases away from the building. Assuming there is a wood stove or other efficient device installed, most heat is conserved for use rather than escaping through the chimney, but maintaining the appropriate chimney height is crucial regardless of heat conservation methods.