ALEX'S NSF EXAM QUESTIONS WITH
CORRECT SOLUTIONS||100%
GUARANTEED PASS||UPDATED
2026/2027 SYLLABUS||A+
GRADED||<<NEWEST VERSION>>
What BSC types have avg min. inflow of 100 and have biologically contaminated
ducts and plenums under negative pressure or surrounded by negative pressure: -
ANSWER ✓ Class II, Type A2, B1, and B2 biological containment cabinets
What's the minimum aerosol upstream concentration in HEPA filter leak test? -
ANSWER ✓ 10 micrograms per liter (F.5.2.1)
Formaldehyde gas decon isn't required in a USED cabinet when - ANSWER ✓
It's been used for Chemo drugs.
Bonus question: how do you decon a cabinet that's been used for chemo drugs? -
ANSWER ✓ Gear up in full protection gear, protect the rest of the room, open the
units, bleach the hell out of the insides, soak the HEPA filters in bleach before
bagging them for disposal.
User states the temp inside the BSC is high, what is the MOST LIKELY problem,
and what would you CHECK FIRST? (different answers per Chase/Damian) -
ANSWER ✓ Check the electronics (ballast, speed control) first, as it's easy.
Most likely problem is the blower motor. The NSF probably wants what you are
going to check first.
What is the minimum efficiency for a filter to be considered a HEPA filter? -
ANSWER ✓ 99.97%
which of the following is not an expression of velocity?
fpm
meters per second
feet per minute
, cfm
cm per second - ANSWER ✓ cfm, as it is a measurement of volume, not velocity.
(fpm^3)
Unless told otherwise by the manufacturer, when measuring the exhaust filter air
flow in a class II type A2 BSC to determine inflow velocity, the ane is positioned: -
ANSWER ✓ 4 inches above the filter
according to NSF/ANSI 49, a thermal anemometer shall have an accuracy of: -
ANSWER ✓ +/-3fpm or 3% of the indicated velocity whichever is larger.
All of the following devices need regular calibration except:
Thermal anemometer
vibration meter
forward light scattering photometer
pitot tube
direct inflow measurement instrument - ANSWER ✓ pitot tube
You are replacing a motor of a BSC w/o tech supportnew motor same as old
except it has four wires (White, black, brown, brown/white) while the old one only
had three wires (White, black, brown). How do you connect the new motor? -
ANSWER ✓ Black to black, white to white, move capacitor next to the motor and
connect motor brown to one capacitor pole and the remaining motor brown/white
to the other pole.
Class II Type A1 cabinets were originally designated - ANSWER ✓ A cabinets.
A cabinet with excessive electrical leakage could result in: - ANSWER ✓
Electrical shock
what is the purpose of the HEPA filter leak test? - ANSWER ✓ To determine the
integrity of HEPA filters, filter housings, and filter mounting frames.
Minimum clearance required above a non-ducted Type A1 when using a thermal
anemometer to measure exhaust velocity is: - ANSWER ✓ 12 inches.
CORRECT SOLUTIONS||100%
GUARANTEED PASS||UPDATED
2026/2027 SYLLABUS||A+
GRADED||<<NEWEST VERSION>>
What BSC types have avg min. inflow of 100 and have biologically contaminated
ducts and plenums under negative pressure or surrounded by negative pressure: -
ANSWER ✓ Class II, Type A2, B1, and B2 biological containment cabinets
What's the minimum aerosol upstream concentration in HEPA filter leak test? -
ANSWER ✓ 10 micrograms per liter (F.5.2.1)
Formaldehyde gas decon isn't required in a USED cabinet when - ANSWER ✓
It's been used for Chemo drugs.
Bonus question: how do you decon a cabinet that's been used for chemo drugs? -
ANSWER ✓ Gear up in full protection gear, protect the rest of the room, open the
units, bleach the hell out of the insides, soak the HEPA filters in bleach before
bagging them for disposal.
User states the temp inside the BSC is high, what is the MOST LIKELY problem,
and what would you CHECK FIRST? (different answers per Chase/Damian) -
ANSWER ✓ Check the electronics (ballast, speed control) first, as it's easy.
Most likely problem is the blower motor. The NSF probably wants what you are
going to check first.
What is the minimum efficiency for a filter to be considered a HEPA filter? -
ANSWER ✓ 99.97%
which of the following is not an expression of velocity?
fpm
meters per second
feet per minute
, cfm
cm per second - ANSWER ✓ cfm, as it is a measurement of volume, not velocity.
(fpm^3)
Unless told otherwise by the manufacturer, when measuring the exhaust filter air
flow in a class II type A2 BSC to determine inflow velocity, the ane is positioned: -
ANSWER ✓ 4 inches above the filter
according to NSF/ANSI 49, a thermal anemometer shall have an accuracy of: -
ANSWER ✓ +/-3fpm or 3% of the indicated velocity whichever is larger.
All of the following devices need regular calibration except:
Thermal anemometer
vibration meter
forward light scattering photometer
pitot tube
direct inflow measurement instrument - ANSWER ✓ pitot tube
You are replacing a motor of a BSC w/o tech supportnew motor same as old
except it has four wires (White, black, brown, brown/white) while the old one only
had three wires (White, black, brown). How do you connect the new motor? -
ANSWER ✓ Black to black, white to white, move capacitor next to the motor and
connect motor brown to one capacitor pole and the remaining motor brown/white
to the other pole.
Class II Type A1 cabinets were originally designated - ANSWER ✓ A cabinets.
A cabinet with excessive electrical leakage could result in: - ANSWER ✓
Electrical shock
what is the purpose of the HEPA filter leak test? - ANSWER ✓ To determine the
integrity of HEPA filters, filter housings, and filter mounting frames.
Minimum clearance required above a non-ducted Type A1 when using a thermal
anemometer to measure exhaust velocity is: - ANSWER ✓ 12 inches.
