Exam Details

  • Exam Code
    :ASCS
  • Exam Name
    :Air Systems Cleaning Specialist
  • Certification
    :NADCA Certifications
  • Vendor
    :NADCA
  • Total Questions
    :148 Q&As
  • Last Updated
    :Jul 02, 2025

NADCA NADCA Certifications ASCS Questions & Answers

  • Question 91:

    An inappropriate method for cleaning an electric reheat coil within a metal duct is:

    A. applying low pressure air.

    B. contact vacuuming.

    C. applying high pressure air.

    D. applying high pressure water.

  • Question 92:

    What is the cleaning method that uses water and/or liquid chemicals?

    A. Surface process

    B. Type 1

    C. Condition 1

    D. Wet process

  • Question 93:

    Power washing method shall NEVER be applied to:

    A. contaminated surfaces.

    B. porous surfaces.

    C. metal surfaces.

    D. coil surfaces.

  • Question 94:

    Which of the following is the MOST effective technique for cleaning an evaporator coil?

    A. Air wash

    B. Wire brush

    C. Wet wash

    D. Hand vacuum

  • Question 95:

    Steam cleaning should never be applied to:

    A. evaporator coils.

    B. porous surfaces.

    C. non-porous surfaces.

    D. condensing coils.

  • Question 96:

    Steam cleaning is considered:

    A. wet-process cleaning.

    B. Type 1 cleaning.

    C. brush-process cleaning.

    D. pneumatic whip cleaning.

  • Question 97:

    Which method of cleaning, along with negative pressure, shall be used to remove particulate from ductwork?

    A. Agitation

    B. Fogging

    C. Ozonation

    D. Coating

  • Question 98:

    Of the following, which is the MOST aggressive agitation tool available for cleaning HVAC systems?

    A. Air compressor

    B. Robot with camera

    C. Metal brush

    D. Skipper

  • Question 99:

    A mechanical means of agitation which an ASCS can use to clean ductwork is:

    A. compressed air needle gun.

    B. compressed air washing.

    C. water blasting.

    D. sand blasting.

  • Question 100:

    Which two factors should be considered to determine the type of air washing equipment to be used?

    A. Source of power and consumption.

    B. Type of debris and surface material.

    C. Type of tool and pressure requirement.

    D. Source of air and cubic feet per minute (CFM) output.

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