ASCS ASCS Equipment and Tools

Question 1

What is the primary function of a negative air machine used during duct cleaning?

Accepted Answer

To create negative pressure inside the duct system so contaminants are captured rather than released

Answer

To pressurize the ducts for leak testing

Answer

To measure airflow velocity

Answer

To sanitize duct surfaces with UV light

Question 2

What type of filter should a negative air machine use to capture fine particulates during duct cleaning?

Accepted Answer

HEPA filter rated to capture 99.97% of particles at 0.3 microns

Answer

Standard fiberglass panel filter

Answer

Electrostatic filter

Answer

Carbon activated filter only

Question 3

Which type of brush is most commonly used for mechanical agitation of debris inside rectangular sheet metal ducts?

Accepted Answer

Rotary or spinning brush attached to a flexible rod or drill

Answer

Wire wheel brush

Answer

Horsehair paintbrush

Answer

Stiff-bristle hand scrub brush

Question 4

What is the purpose of an air whip or skipper ball tool in duct cleaning?

Accepted Answer

To use compressed air to propel the tool through ducts and dislodge debris with air jets

Answer

To seal access holes after cleaning

Answer

To measure dust accumulation thickness

Answer

To apply chemical coatings inside ducts

Question 5

What is the minimum CFM (cubic feet per minute) capacity typically recommended for a negative air machine used in commercial duct cleaning?

Accepted Answer

At least 1,000 CFM to maintain adequate negative pressure in larger systems

Answer

100 CFM is sufficient for all systems

Answer

CFM does not matter as long as HEPA is present

Answer

500 CFM maximum to avoid duct damage

Question 6

How should duct cleaning equipment be maintained to prevent cross-contamination between job sites?

Accepted Answer

Thoroughly cleaned and HEPA-vacuumed after each job before transporting to the next site

Answer

Rinsed with water between jobs only

Answer

Stored in an open truck bed to air out

Answer

Used until visibly dirty then replaced