NATE Air Distribution Service Practice Questions - NATE Air Distribution Service Specialty Exam

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A technician needs to measure total external static pressure (TESP) on a residential furnace. Where should the two pressure probes be placed?

Across the evaporator coil only In the return plenum before the blower and in the supply plenum after the heat exchanger/coil At the farthest supply register and the nearest return grille Across the air filter on both sides

Correct Answer:

In the return plenum before the blower and in the supply plenum after the heat exchanger/coil

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