NADCA EXAM QUESTIONS WITH
CORRECT SOLUTIONS||100%
GUARANTEED PASS||UPDATED
2026/2027 SYLLABUS||A+
GRADED||<<NEWEST VERSION>>
Air-Handling Unit (AHU) - ANSWER ✓ A packaged assembly, usually
connected to ductwork, that moves air and may also clean and condition air.
Central-Station Air Handling Unit - ANSWER ✓ Factory made encased assembly
consisting of the fan or fans and other necessary equipment, that perform one or
more functions of circulating, cleaning, heating, cooling, humidifying,
dehumidifying, and mixing of air; does not include a heating or cooling source.
Cooling-Heating Unit - ANSWER ✓ Unit that includes means for cooling and
heating, and which may also included means for other air-handling unit functions
Cooling Unit - ANSWER ✓ Unit that includes means for cooling and which may
also include means for other air-handling unit functions
Heating Unit - ANSWER ✓ Unit that includes means for heating and which may
also include the means for other air-handling unit functions
Make-Up Air Unit - ANSWER ✓ Factory assembled fan-heater or
cooling/dehumidifying unit that supplies tempered fresh air to replace air that is
exhausted. Centrifugal or axial fans are used with direct gas-fired, electric, or water
heater sections
Ventilation Unit - ANSWER ✓ Unit with means to provide ventilation, and
which may also include means for other air-handling unit functions
Air Scrubber - ANSWER ✓ An air filtration device using a HEPA filtration
configured to re-circulate air within a defined space
, Ambient Air Cleaning - ANSWER ✓ The process of removing particulate from
indoor air outside of the HVAC system
Antimocrobial - ANSWER ✓ Describes an agent that kills or inactivates
microorganisms or suppresses microbial growth
Assessment - ANSWER ✓ A comprehensive review and evaluation of the HVAC
system, or representative portions thereof, to make a preliminary determination of
which general forms of contamination are present and to document the overall
system cleanliness level
ASHRAE - ANSWER ✓ American Society of Heating, Refrigerating, and Air-
Conditioning Engineers
ASTM International - ANSWER ✓ American Society for Testing and Materials
Bioaerosols - ANSWER ✓ Airborne particles of biological origin
Biological Contaminants - ANSWER ✓ Bacteria, fungi (mold and mildew),
spores, viruses, animal dander, mites, insects, pollen, and the by-products of these
elements
Cleaning - ANSWER ✓ The removal of visible particulate and biologicals to a
level defined within this document
Closure (1) - ANSWER ✓ An access door or panel installed on the air duct or air-
handling unit to create a permanent seal
Closure (2) - ANSWER ✓ Device or material used in closing a service opening
Closure Panel - ANSWER ✓ Sheet metal, or other appropriate material used for
permanently closing a service opening
Coatings - ANSWER ✓ See "Surface Treatments"
Coils - ANSWER ✓ Devices inside an HVAC system that temper and/or
dehumidify the air handled by the HVAC system. Include heat exchangers with or
CORRECT SOLUTIONS||100%
GUARANTEED PASS||UPDATED
2026/2027 SYLLABUS||A+
GRADED||<<NEWEST VERSION>>
Air-Handling Unit (AHU) - ANSWER ✓ A packaged assembly, usually
connected to ductwork, that moves air and may also clean and condition air.
Central-Station Air Handling Unit - ANSWER ✓ Factory made encased assembly
consisting of the fan or fans and other necessary equipment, that perform one or
more functions of circulating, cleaning, heating, cooling, humidifying,
dehumidifying, and mixing of air; does not include a heating or cooling source.
Cooling-Heating Unit - ANSWER ✓ Unit that includes means for cooling and
heating, and which may also included means for other air-handling unit functions
Cooling Unit - ANSWER ✓ Unit that includes means for cooling and which may
also include means for other air-handling unit functions
Heating Unit - ANSWER ✓ Unit that includes means for heating and which may
also include the means for other air-handling unit functions
Make-Up Air Unit - ANSWER ✓ Factory assembled fan-heater or
cooling/dehumidifying unit that supplies tempered fresh air to replace air that is
exhausted. Centrifugal or axial fans are used with direct gas-fired, electric, or water
heater sections
Ventilation Unit - ANSWER ✓ Unit with means to provide ventilation, and
which may also include means for other air-handling unit functions
Air Scrubber - ANSWER ✓ An air filtration device using a HEPA filtration
configured to re-circulate air within a defined space
, Ambient Air Cleaning - ANSWER ✓ The process of removing particulate from
indoor air outside of the HVAC system
Antimocrobial - ANSWER ✓ Describes an agent that kills or inactivates
microorganisms or suppresses microbial growth
Assessment - ANSWER ✓ A comprehensive review and evaluation of the HVAC
system, or representative portions thereof, to make a preliminary determination of
which general forms of contamination are present and to document the overall
system cleanliness level
ASHRAE - ANSWER ✓ American Society of Heating, Refrigerating, and Air-
Conditioning Engineers
ASTM International - ANSWER ✓ American Society for Testing and Materials
Bioaerosols - ANSWER ✓ Airborne particles of biological origin
Biological Contaminants - ANSWER ✓ Bacteria, fungi (mold and mildew),
spores, viruses, animal dander, mites, insects, pollen, and the by-products of these
elements
Cleaning - ANSWER ✓ The removal of visible particulate and biologicals to a
level defined within this document
Closure (1) - ANSWER ✓ An access door or panel installed on the air duct or air-
handling unit to create a permanent seal
Closure (2) - ANSWER ✓ Device or material used in closing a service opening
Closure Panel - ANSWER ✓ Sheet metal, or other appropriate material used for
permanently closing a service opening
Coatings - ANSWER ✓ See "Surface Treatments"
Coils - ANSWER ✓ Devices inside an HVAC system that temper and/or
dehumidify the air handled by the HVAC system. Include heat exchangers with or
