ASCS Post-Cleaning Verification and Testing 2 — Questions and Answers
Question 1: Which instrument is commonly used to detect and quantify airborne particulate matter during post-cleaning air quality verification?
- Manometer
- Hygrometer
- Particle counter (Correct answer)
- Anemometer
Correct answer: Particle counter
A particle counter measures airborne particles by size and concentration, making it the appropriate tool for verifying air quality improvement after cleaning.
Question 2: In HVAC post-cleaning verification, what does 'source removal' confirmation verify?
- That chemical cleaners have been fully rinsed from duct surfaces
- That contaminants have been physically extracted from the HVAC system (Correct answer)
- That the original contamination source has been identified and documented
- That filter media has been replaced after cleaning
Correct answer: That contaminants have been physically extracted from the HVAC system
Source removal verification confirms that contaminants have been physically extracted and removed from the HVAC system, not just displaced or encapsulated.
Question 3: A third-party post-cleaning inspection is performed by whom?
- A senior technician from the same cleaning company
- The building's maintenance manager
- An independent inspector not affiliated with the cleaning contractor (Correct answer)
- An OSHA compliance officer
Correct answer: An independent inspector not affiliated with the cleaning contractor
A third-party inspection is conducted by an independent inspector with no affiliation to the cleaning contractor, ensuring an unbiased assessment.
Question 4: What type of camera is most effective for detailed visual inspection of interior ductwork surfaces after cleaning?
- Thermal imaging (infrared) camera
- Video borescope or robotic inspection camera (Correct answer)
- Standard digital camera with flash
- Ultraviolet (UV) camera
Correct answer: Video borescope or robotic inspection camera
A video borescope or robotic inspection camera allows direct visual inspection of interior duct surfaces that cannot be accessed by a technician.
Question 5: How does a post-cleaning particle count comparison typically work?
- Particles are counted at a single interior duct location only
- Outdoor air particle levels are measured and compared to indoor levels
- Particle counts are taken before cleaning begins and after to demonstrate improvement (Correct answer)
- Only post-cleaning particle counts are documented
Correct answer: Particle counts are taken before cleaning begins and after to demonstrate improvement
Pre- and post-cleaning particle counts are taken and compared to demonstrate the quantifiable improvement achieved by the cleaning process.
Question 6: Which of the following is NOT a typical component of post-cleaning verification documentation?
- Photographs of accessible duct areas
- List of HVAC components cleaned
- Customer's personal financial information (Correct answer)
- Inspector's name and certification number
Correct answer: Customer's personal financial information
Customer financial information is not relevant to post-cleaning verification and has no place in a cleaning completion report.
Question 7: When verifying that an air handling unit (AHU) has been properly cleaned, which components should an ASCS technician inspect?
- Electrical wiring and control panels only
- Coils, drain pans, blower section, and accessible interior surfaces (Correct answer)
- Exterior casing and access door hinges only
- Refrigerant lines and compressor unit
Correct answer: Coils, drain pans, blower section, and accessible interior surfaces
Coils, drain pans, blower section, and interior surfaces are the primary AHU components that accumulate contamination and must be verified as clean.
ASCS Post-Cleaning Verification and Testing 2
Which instrument is commonly used to detect and quantify airborne particulate matter during post-cleaning air quality verification?