Duct systems shall not be interconnected with any other building ventilation or exhaust system. Which of the following describes what they must not be interconnected with?

• A. Other building ventilation or exhaust system
• B. Electric power distribution
• C. Plumbing lines
• D. Gas piping

Answer: (A)

Duct systems for kitchen hoods must be kept separate from all other building ventilation or exhaust systems. This isolation prevents cross-connection that could allow smoke, fumes, or fire to travel through the ducts to different parts of the building and ensures the exhaust path and fire protection equipment operate as intended. The requirement is specifically about not tying the hood/duct system into other ventilation or exhaust ducts, so it shouldn’t be interconnected with any other building ventilation or exhaust system. Utilities like electric power distribution, plumbing, or gas piping are separate systems and aren’t what this rule addresses in the same way.