What is the maximum length for dead-end corridors that are not sprinklered?

The maximum length for dead-end corridors that are not sprinklered is indeed 20 feet, which is primarily based on fire safety regulations outlined in building codes. This rule is in place to ensure that, in the event of a fire, occupants have a shorter distance to travel to reach an exit or an area of safety. Dead-end corridors, being those which do not lead directly to an exit, pose a risk if they are too long, as they can trap occupants and inhibit safe evacuation.

In codes such as the International Building Code (IBC) or NFPA Life Safety Code, the 20-foot limit helps minimize the risk associated with smoke and fire by encouraging quick access to exits. Longer corridors without adequate fire protection (like sprinklers) can lead to dangerous conditions where smoke could build up and visibility could be severely compromised.

The other potential lengths provided in the choices exceed the established limit for unsprinklered dead-end corridors, which directly contributes to the rationale behind the 20-foot guideline. Therefore, understanding these specifics contributes to ensuring safety protocols are adhered to in design practices.