In a means of egress, protection of stairwells from __________ is extremely important.

• A. Water leaks
• B. Products of combustion
• C. Electrical faults
• D. Noise

Answer: (B)

Protecting stairwells from products of combustion is essential because the means of egress must stay tenable during a fire. Smoke and other combustion byproducts can rapidly infiltrate stair enclosures, through door gaps, penetrations, and vents, making stairs unsafe and hindering evacuation and firefighting operations. Fire-rated construction and proper door assemblies, and, where required, stair pressurization or smoke control, help keep stairwells free of smoke and toxic gases so occupants can reach exits safely. While water leaks, electrical faults, or noise pose other issues, they do not threaten the viability of the egress path as directly as smoke exposure does.