Retrotec USACE - Manual (Page 305)

Appendix F F11
tested with four door fans simultaneously to measure the total enclosure leak-
age (bottom left).
Figure F2. Example four-story building.
In buildings where individual apartments have doors to the outside
(Figure 2, top left), the test must be performed on an individual apartment
with the adjacent apartments open to outdoors. Perform door fan tests on all
corner apartments plus a random 20 percent of those remaining. If they all
pass then it can be assumed the rest of the apartments would also pass. Should
any one apartment fail, an additional apartment must be added for each failure
to the test until at least 90 percent of the tested units pass.
Figure F3. Example building where individual apartments have doors to the outside
F.9.3 Equipment Selection
Since a passing grade requires the envelope to attain a specifi ed leakage rate,
e.g. of 0.25 CFM/sq ft (1.27 L/s*m
2 ) of envelope or less, multiply the largest
envelope you wish to test by 0.25 to get the approximate “passing” CFM or