CETA Calculations Questions and Correct Answers | Latest Update
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Course
CETA
Institution
CETA
Explain how to calculate air changes per hour.
-:- 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
-:- Length x width x fpm = CFM.
Total CFM divided by...
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
2|P a g e | G r a d e A + | 2 0 2 0 2 5
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