Membrane penetrations in walls that require a fire-resistance rating must have fixtures installed in such a way that what requirement is not reduced?

The correct answer is that fire-resistance must not be reduced. Membrane penetrations in fire-rated walls must be carefully designed and installed to maintain the wall's fire-resistance rating. This means that any openings created by electrical conduits, plumbing, or HVAC systems must be sealed properly with firestop systems or other approved methods to prevent the passage of fire and smoke.

Maintaining the fire-resistance rating is crucial because it directly relates to the safety of the building's occupants and the effectiveness of the fire protection measures in place. If a penetration compromises this rating, it increases the risk of fire spreading through the wall, which could endanger lives and property.

While structural integrity, accessibility, and energy efficiency are important factors in building design, the primary concern for penetrations in fire-rated walls is to ensure that the fire-resistance quality remains intact, thus safeguarding against potential hazards associated with fire incidents.