ASCS Equipment and Tools Flashcards
6 cards from real ASCS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ASCS Equipment and Tools flashcards as text
What is a 'contact vacuum' cleaning method in HVAC duct cleaning?
Answer: Vacuuming while keeping the nozzle in direct contact with the duct surface to remove loose debris
Contact vacuuming requires the vacuum nozzle to maintain direct surface contact to maximize debris pickup efficiency rather than drawing air from a distance.
What is the function of a duct sealing tool or access panel cover after cleaning is complete?
Answer: To restore the airtight integrity of the duct system by sealing all access openings made during cleaning
Properly sealing access openings restores the duct system's air tightness, preventing energy loss, pressure imbalance, and potential re-contamination.
When using compressed air tools during duct cleaning, what precaution prevents spreading contaminants into occupied spaces?
Answer: Ensuring the negative air machine is running and creating negative pressure before using compressed air agitation
Negative pressure must be established before compressed air agitation begins so that dislodged contaminants flow toward the collection device rather than into the building.
What does a manometer measure in the context of HVAC duct cleaning?
Answer: Pressure differential or static pressure within the duct system
A manometer measures pressure differentials, allowing technicians to verify negative pressure levels and assess duct system static pressure during cleaning operations.
Which tool is used to apply EPA-registered antimicrobial coatings inside ductwork after cleaning?
Answer: Fogging machine or ULV (ultra-low volume) sprayer designed for duct application
Fogging machines and ULV sprayers disperse antimicrobial chemicals as fine droplets that reach all interior duct surfaces evenly, including areas inaccessible by direct application.
Why should flexible ductwork (flex duct) be handled with care during the mechanical cleaning process?
Answer: Aggressive mechanical agitation can tear the inner liner, rendering the duct section unserviceable
The inner plastic liner of flexible ductwork is susceptible to tearing from overly aggressive brushing or compressed air, requiring gentler cleaning methods to preserve its integrity.