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Canada Communicable Disease Report

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Volume: 22S1 • April 1996

Guidelines for Preventing the Transmission of Tuberculosis in Canadian Health Care Facilities and Other Institutional Settings

Appendix F
Air Changes Per Hour and Time in Minutes Required for Removal Efficiencies of 90%, 99% or 99.9% of Airborne Contaminants*

Minutes required for a removal efficiency of:

Air Changes Per Hour
90%
99%
99.9%
1
138
276
414
2
69
138
207
3
46
92
138
4
35
69
104
5
28
55
83
6
23
46
69
7
20
39
59
8
17
35
52
9
15
31
46
10
14
28
41
11
13
25
38
12
12
23
35
13
11
21
3
14
10
20
30
15
9
18
28
16
9
17
26
17
8
16
24
18
8
15
23
19
7
15
22
20
7
14
21
* This table is prepared according to the formula t=(in C2/C1)/(Q/V)=60, which is an adaptation of the formula for the rate of purging airborne contaminants (100-Mutchler 1973) with t1=0 and C2/C1=1— (removal efficiency/100).
Source:
Adapted from CDC. Guidelines for preventing the transmission of Mycobacterium tuberculosis in health-care facilites, 1994. MMWR 1994;43(No. RR-13):1-32.

 

 

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