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CETA Calculations Exam Questions and Answers
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CETA Calculations Exam Questions and Answers
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CETA Calculations Exam Questions andAnswers
Explain how to calculate air changes per hour. - Answer -Room dimension: length x
width x height = cubic feet.
Total CFM from all HEPA filters in room.
Total CFM / Room volume x 60 = ACPH.
Explain how to calculate air changes per hour from PEC - Answer -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.
- Answer -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. - Answer -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. - Answer -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
(1198 CFM)
2 nozzles over 1,000 CFM.
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