NCT Air Filtration Fundamentals & Filter Media

Question 1

What does MERV stand for in air filtration?

Accepted Answer

Maximum Efficiency Reporting Value

Answer

Minimum Energy Recovery Ventilation

Answer

Measured Efficiency Rating Volume

Answer

Minimum Environmental Regulation Value

Question 2

Which MERV rating range is typically used for commercial buildings requiring superior particulate control?

Accepted Answer

MERV 13–16

Answer

MERV 1–4

Answer

MERV 5–8

Answer

MERV 9–12

Question 3

A HEPA filter must capture what minimum percentage of particles at 0.3 microns?

Accepted Answer

99.97%

Answer

95%

Answer

97%

Answer

99.50%

Question 4

Which particle size is considered the Most Penetrating Particle Size (MPPS) for standard air filtration media?

Accepted Answer

0.3 microns

Answer

10 microns

Answer

5 microns

Answer

1 micron

Question 5

What filtration mechanism primarily captures large particles (>1 micron) through direct contact with filter fibers?

Accepted Answer

Inertial impaction

Answer

Diffusion

Answer

Electrostatic attraction

Answer

Interception

Question 6

Arrestance, as used in air filter testing, measures the filter's ability to capture which type of test dust?

Accepted Answer

ASHRAE standard synthetic test dust

Answer

Fine atmospheric dust

Answer

Diesel exhaust particulate

Answer

Pollen and mold spores

Question 7

Which filter type uses a charged medium to enhance particle capture without significantly increasing resistance to airflow?

Accepted Answer

Electret filter

Answer

Fiberglass panel filter

Answer

Activated carbon filter

Answer

ULPA filter