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CETA Calculations All Possible Questions and Answers with complete solution
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Explain how to determine particles measuring in cubic feet per minute and reporting them in cubic meter per minute. - Take your total counts of 24 per cubic feet per minute and multiply by 35.2 = 844.8. Round up to 845 cubic meters per minute Explain how to calculate air changes per hour from P...

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  • September 12, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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CETA Calculations
Explain how to determine particles measuring in cubic feet per minute and reporting them in cubic
meter per minute. - Take your total counts of 24 per cubic feet per minute and multiply by 35.2 =
844.8.

Round up to 845 cubic meters per minute



Explain how to calculate air changes per hour from PEC - Length x width x fpm = CFM.



Total CFM divided by room volume x 60 = ACPH per that particle PEC.



Explain how to determine minimum CFM required from ceiling HEPA filters in HD room. - Take
minimum 30 ACPH (or whatever ACPH for that ISO Class) / 60 = 0.5 and multiply by the room volume
(500 cu. ft.) =250 CFM total HEPA filtered air supply.



Explain how to calculate the quality of particle counts in a room. - Take room dimensions of 300"
length x 413" width to achieve 123,900 in2 and divide by 144 = 860.417 ft2.



Convert feet to meters.

Take 860.417 ft2 x 0.093 = 80.02

Take the square root of 80.02. The number of sample locations for this room is 9.



Explain how to calculate a challenge for an aerosol leak test. - Take total Supply and total CFM.
(Supply of 400 CFM + Exhaust of 150 CFM = 550 CFM)

Total supply x fpm = CFM.

(550 CFM)

1 nozzle per 1,000 CFM.

1 nozzle: 13,500/550

=24.54 = 25

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