Which type of air connectors shall not pass through walls, floors, or ceilings?

• A. Rigid
• B. Flexible
• C. Metallic
• D. Insulated

Answer: (B)

The type of air connectors that shall not pass through walls, floors, or ceilings is flexible air connectors. This is primarily due to safety and building code regulations, which mandate that certain types of connectors must be used in specific applications to reduce risks such as fire hazards and structural damage.

Flexible connectors, while highly useful for certain applications due to their adaptability and ease of installation, do not provide the same structural integrity and fire-resistance characteristics as rigid connectors or metallic ducts. They are generally intended to be used for short runs or in non-permanent applications, where flexibility is required for connection to equipment, but not for through-wall or through-ceiling installations.

On the other hand, rigid, metallic, and insulated ducts are designed to maintain their shape and provide secure pathways for air flow over longer distances and through structural barriers. This ensures that they are compliant with building codes and provide safe ventilation without compromising the integrity of building structures.