What is the proper method for functional testing air sampling-type systems?

What is the proper method for functional testing air sampling-type systems?

• A. Smoke is introduced at the end sampling port, or at some point on each branch pipe.
• B. Smoke is introduced at the main supply duct.
• C. A smoke detector is removed for testing.
• D. Visual inspection only.

Answer: (A)

Functional testing of air-sampling-type systems focuses on proving that every sampling line and detector will respond when smoke is present in the system. Introducing smoke at the end of each sampling port, or at points along each branch, ensures the smoke actually travels through all the sampling paths and reaches every detector. This validates full coverage and confirms detectors will trigger as air is drawn through the lines. Testing by putting smoke into the main supply duct only checks the main flow path and doesn’t verify that each branch and its detectors respond. Removing a smoke detector during testing bypasses part of the system, and relying on visual inspection alone doesn’t confirm functional operation. So, placing smoke at the end-port or along each branch is the proper method because it directly verifies the detection network’s performance across the entire system.

Functional testing of air-sampling-type systems focuses on proving that every sampling line and detector will respond when smoke is present in the system. Introducing smoke at the end of each sampling port, or at points along each branch, ensures the smoke actually travels through all the sampling paths and reaches every detector. This validates full coverage and confirms detectors will trigger as air is drawn through the lines. Testing by putting smoke into the main supply duct only checks the main flow path and doesn’t verify that each branch and its detectors respond. Removing a smoke detector during testing bypasses part of the system, and relying on visual inspection alone doesn’t confirm functional operation. So, placing smoke at the end-port or along each branch is the proper method because it directly verifies the detection network’s performance across the entire system.