CETA Calculations Exam Questions and Answers |100% Pass

CETA Calculations Exam Questions and Answers |100% Pass 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. EMILLYCHARLOTTE 2024/2025 ACADEMIC YAER ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISH SEPTEMBER 2024 Page 2/4 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