Nafa Certified Air Filter Specialist Examination Actual Exam Complete Questions And Verified Solutions Latest Update This Year

NAFA CERTIFIED AIR FILTER
SPECIALIST EXAMINATION
ACTUAL EXAM COMPLETE
QUESTIONS AND VERIFIED
SOLUTIONS LATEST UPDATE THIS
YEAR



✅ NAFA CAFS Exam Coverage
Exam Foundation: Questions are entirely derived from the
NAFA Guide to Air Filtration (latest edition).
1) Fundamentals of Air Filtration
 Composition of air & types of airborne contaminants
(gases, particulates, aerosols)
 Particle size concepts (micron, nanometer, MPPS)
 Airflow definitions (CFM, face velocity, volume vs.
velocity)
 Principles of filtration & capture mechanisms
(impingement, interception, diffusion, straining)
2) Filter Performance Metrics

,  Efficiency ratings (MERV, HEPA, ULPA)
 Pressure drop & resistance
 Dust holding capacity
 Filter life expectancy & performance curves
 Most Penetrating Particle Size (MPPS)
3) Filter Types & Media
 Mechanical filters (pleated, panel)
 HEPA & ULPA filters
 Electrostatic air cleaners
 Media characteristics & construction
 Adhesive-treated fibers & electrostatic effects
4) Standards & Testing Protocols
 ANSI/ASHRAE standards (especially 52.2)
 ISO standards related to air filtration
 Test dust composition & standardized testing methods
5) System Design & Application
 HVAC system integration
 Multi-stage filtration systems
 Filter selection for specific environments (healthcare,
industrial, cleanrooms)

,  Air change rates & ventilation basics
6) Installation, Operation & Maintenance Principles
 Proper filter installation
 Sealing & bypass prevention
 Monitoring & maintenance schedules
 Safety practices & handling contaminated filters
7) Air Quality Control Concepts
 Indoor Air Quality (IAQ) fundamentals
 Contaminant control strategies
 Environmental and health impacts of filtration




1. A hospital needs 99.97% efficiency at 0.3 μm; which
filter category best meets this requirement?
A. MERV 8
B. HEPA
C. Activated carbon panel
D. Electrostatic filter
Answer: B
Rationale: HEPA is defined to achieve ≥99.97% at 0.3
μm, essential for critical healthcare air cleanliness.

, 2. A system shows higher static pressure than expected;
what happens to face velocity if CFM remains
constant?
A. Decreases
B. Increases
C. Unchanged
D. Oscillates
Answer: A
Rationale: If pressure drop rises due to loading,
velocity at the media surface typically decreases if
airflow rate is constant.
3. Which capture mechanism is most effective for
particles <0.1 μm?
A. Interception
B. Impingement
C. Diffusion
D. Straining
Answer: C
Rationale: Brownian motion dominates very small
particles, making diffusion the primary capture path.
4. A facility wants to reduce HVAC energy costs without
sacrificing filtration; what adjustment should be
considered?
A. Increase pleat spacing
B. Select a filter with lower initial pressure drop