CETA CALCULATIONS TEST WITH COMPLETE
SOLUTION
Describe the process of calculating air changes per hour. - ANSWER The cubic
feet of a room are equal to its length, width, and height.
Total CFM of all the room's HEPA filters.
Room volume x 60 / Total CFM = ACPH.
Explain the process of calculating air changes per hour using PEC. Length x width
x fpm = CFM is the answer.
According to that particle PEC, total CFM divided by room volume x 60 = ACPH.
Describe how to calculate the minimum CFM that an HD room's ceiling HEPA
filters must provide. - ANSWER The total HEPA filtered air supply is 250 CFM
when you multiply the minimum 30 ACPH (or whichever ACPH is appropriate for
that ISO Class) / 60 = 0.5 by the room volume (500 cu. ft.).
Describe the process for determining a room's particle count quality. - ANSWER
To get 123,900 in2, use the room's dimensions: 300" long by 413" wide. Then,
divide that number by 144 to get 860.417 ft2.
Measure in feet and convert to meters.
Assume 0.093 x 860.417 ft2 = 80.02.
Find 80.02's square root. There are nine sample locations in this room.
SOLUTION
Describe the process of calculating air changes per hour. - ANSWER The cubic
feet of a room are equal to its length, width, and height.
Total CFM of all the room's HEPA filters.
Room volume x 60 / Total CFM = ACPH.
Explain the process of calculating air changes per hour using PEC. Length x width
x fpm = CFM is the answer.
According to that particle PEC, total CFM divided by room volume x 60 = ACPH.
Describe how to calculate the minimum CFM that an HD room's ceiling HEPA
filters must provide. - ANSWER The total HEPA filtered air supply is 250 CFM
when you multiply the minimum 30 ACPH (or whichever ACPH is appropriate for
that ISO Class) / 60 = 0.5 by the room volume (500 cu. ft.).
Describe the process for determining a room's particle count quality. - ANSWER
To get 123,900 in2, use the room's dimensions: 300" long by 413" wide. Then,
divide that number by 144 to get 860.417 ft2.
Measure in feet and convert to meters.
Assume 0.093 x 860.417 ft2 = 80.02.
Find 80.02's square root. There are nine sample locations in this room.
