Certification Examination Practice

Illinois Industrial Ventilation Technician Certification Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of industrial ventilation?
• To cool machinery
• To remove or control airborne contaminants
• To reduce energy consumption
• To improve lighting
• To remove or control airborne contaminants

Rationale: Industrial ventilation systems are designed primarily to

control exposure to harmful airborne substances, protecting worker health. 1 / 4

• Which type of ventilation system is most effective for controlling

localized contaminants?

• General dilution ventilation
• Local exhaust ventilation
• Natural ventilation
• Mechanical ventilation
• Local exhaust ventilation

Rationale: Local exhaust ventilation (LEV) captures contaminants at

or near the source before they spread into the workplace.

• In a ventilation system, what is the function of a hood?
• To store air filters
• To capture contaminants at the source
• To circulate indoor air
• To reduce energy use
• To capture contaminants at the source

Rationale: Hoods are positioned to effectively capture dusts, fumes,

or gases immediately where they are generated.

• What is the recommended face velocity for a laboratory chemical

fume hood?

• 50-75 fpm
• 80-120 fpm
• 100-150 fpm
• 150-200 fpm 2 / 4

• 80-120 fpm

Rationale: A face velocity of 80-120 feet per minute ensures

contaminants are safely drawn into the hood without causing turbulence or escape.

• Which device is used to measure the airflow in a duct?
• Manometer
• Anemometer
• Barometer
• Hygrometer
• Anemometer

Rationale: An anemometer measures the velocity of air moving

through a duct, which is essential for verifying ventilation system performance.

• What is the primary difference between a supply fan and an exhaust

fan?

• Supply fan removes air, exhaust fan adds air
• Supply fan adds air, exhaust fan removes air
• Both add air, but at different pressures
• Both remove air, but at different rates
• Supply fan adds air, exhaust fan removes air

Rationale: Supply fans push fresh air into a space, while exhaust fans

remove contaminated or stale air. 3 / 4

• Which type of hood is typically used for large, stationary sources of

dust in industrial processes?

• Slot hood
• Canopy hood
• Enclosure hood
• Backshelf hood
• Canopy hood

Rationale: Canopy hoods are placed above large machines or

processes to capture rising contaminants such as heat, smoke, or fumes.

• What is the primary purpose of a dust collector in an industrial

ventilation system?

• To move air efficiently
• To remove particulate matter from the air
• To measure airflow
• To increase duct pressure
• To remove particulate matter from the air

Rationale: Dust collectors filter airborne particles, preventing them

from circulating back into the workplace.

• Which of the following factors most affects hood capture efficiency?
• Duct material
• Hood design and placement
• Fan horsepower
• / 4