NADCA EXAM WITH 100% CORRECT ANSWERS 2024.

Bioaerosols - ANSWER-Airborne particles of biological origin Debris - ANSWER-Non-adhered substances not intended to be present that is located within the HVAC system Abrasion - ANSWER-A surface loss of material due to friction Access - ANSWER-The ability to gain entry to the interior of the air duct or HVAC component Access Door - ANSWER-Fabricated metal barrier (hatch) by which a service opening is accessed or closed Adhered Substance - ANSWER-A material, such as mastic, that is not removable by direct contact vacuuming ACGIH - ANSWER-American Conference of Governmental Industrial Hygienists Adhered Particulate - ANSWER-Any material not intended or designed to be present in an HVAC system, and which must be dislodged in order to be removed Aerosols - ANSWER-Solid or liquid airborne particles AIHA - ANSWER-American Industrial Hygiene Association Air Duct - ANSWER-A passageway for distribution and extraction of air, excluding plenums not installed in accordance with SMACNA Standards (See ASHE Terminology of Heating, Ventilation, Air Conditioning & Refrigeration 1991) Air Duct Covering - ANSWER-Materials such as insulation and banding used to cover the external surface as a duct Air Duct Lining - ANSWER-Generally refers to fiber glass or other matting affixed to the interior surfaces of the air ducts for the thermal insulation and noise attenuation Air Filtration Device (AFD) - ANSWER-A portable or transportable, self-contained blower assembly designed to move a defined volume of air equipped with one or more stages of particulate filtration. Air Sweeping - ANSWER-A process that uses a pressurized air source combined with either handheld blowguns or a hose with a remote nozzle attachment to move particulate and debris within an HVAC system during cleaning Air Systems Cleaning Specialist (ASCS) - ANSWER-Designation is awarded by NADCA to industry professionals who satisfactorily complete a written certification examination testing knowledge of HVAC systems, cleaning standards and best practices 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 without extended surfaces through which water, ethylene glycol solution, brine, volatile refrigerant, or steam is circulated for the purpose of total cooling (sensible cooling plus latent cooling) or sensible heating of a forced-circulation air stream Collection Device - ANSWER-A HEPA- filtered machine designed primarily to collect debris, filter particulate and discharge air back to the indoor environment, or a fan driven non-HEPA-filtered machine that is designed to collect debris, and then filter particulate while discharging the air outside the building envelope Conditions - ANSWER-Conditions 1, 2, and 3 are defined for indoor environments relative to mold Condition 1 (Normal Ecology) - ANSWER-An indoor environment that may have settled spores, fungal fragments or traces of actual growth whose identify, location and quantity is reflective of a normal fungal ecology for an indoor environment Condition 2 (Settled Spores and Trace Growth) - ANSWER-An indoor environment, which is primarily contaminated with settled spores that were dispersed directly or indirectly from Condition 3 area, and which may have traces of actual growth Condition 3 (Actual Growth) - ANSWER-An indoor air environment contaminated with the presence of actual mold growth and associated spores. Actual growth that is active or dormant, visible, or hidden Constant Air Volume System - ANSWER-An air-handling system involving a continuous level of airflow