NADCA ASCS Exam
Air Systems Cleaning Specialist (Page 5 )

Updated On: 7-Feb-2026

What is the MOST effective way for an ASCS to test the function of a condensate pump?

  1. Unplug and plug in the pump
  2. Fill the condensate pan with clean water
  3. Disconnect the condensate drain line
  4. Fill the pump with clean water

Answer(s): C



Which component is designed to provide the difference in air pressure required to distribute air throughout a system?

  1. Heating coil
  2. Centrifugal fan
  3. Cooling coil
  4. Turning vane

Answer(s): B



An ASCS finds leaks in the supply ductwork of a residential HVAC system that is located in an attic. This will MOST likely cause:

  1. positive pressurization of the occupied space.
  2. balanced pressurization of the occupied space.
  3. negative pressurization of the occupied space.
  4. cleaner air for the occupied space.

Answer(s): C



Which of the following HVAC components controls the room air by regulating hot and cold air?

  1. VAV box
  2. Mixing box
  3. Attenuator
  4. Constant volume damper

Answer(s): B



The MOST common control release mechanism for fire dampers is:

  1. fusible links.
  2. pneumatic controls.
  3. electromagnetic controls.
  4. pulling the building fire alarm device.

Answer(s): A



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