Retrotec USACE User Manual
Page 319
Appendix F F25
6
Calculate and Report Results
6.9
The exponent n
d
for depressurization.
(NOTE: if n
d
is less than 0.5 or greater than 1.0, test data is invalid and test must
be repeated.)
6.10
Calculate L/s (cfm) referenced to STP at –75Pa (–0.3 in w.g. )
L/s (cfm)
6.11
L/s *m
2
of envelope @–75Pa (CFM/sq ft @–0.3 in. w.g.)
L/s *m
2
@75Pa or cfm/
sq ft @0.3 in.w.g.
6.12
The correlation coeffi cient, r
2
, of the curve fi tted data with a minimum of 12 points.
(NOTE: if r
2
is less than 0.95, test data is invalid and test must be repeated.)
6.13
Calculate the 95% confi dence interval at –75 Pa for test in depressurization.
(NOTE: if confi dence intervals exceed +/– 0.025 of the value in 6.4, test data is
invalid and test must be repeated if the value in 6.4 is 0.25 or less. If the value is
greater than 0.25, the confi dence interval must not exceed +/– 10% of the value in
6.4).
L/s *m
2
@75Pa or cfm/
sq ft @0.3 in.w.g.
Both Pressurization and Depressurization
L/s(cfm)
6.14
Calculate the average L/s or CFM/sq ft from 6.5 and 6.10
L/s *m
2
@75Pa or cfm/
sq ft @0.3 in.w.g.
6.15
Calculate the average 95% confi dence interval for L/s *m
2
@75Pa or cfm/sq ft
@0.3 in.w.g from 6.6 and 6.12.
L/s *m
2
@75Pa or cfm/
sq ft @0.3 in.w.g.
6.16
Building passes if the value 6.14 is less than requirement (e.g., 0.25 CFM/sq ft at
0.3. in w.g.)
Pass/fail
6.17
For the purpose of visualizing the magnitude of the air leakage of the enclosure,
calculate the equivalent leakage area in m
2
(square feet) at 75 Pa.
m
2
(sq ft)
7.
Perform a diagnostic evaluation in accordance with ASTM C1060 and ASTM E1186. Attach results of
diagnostic evaluation to this test form.
8.
Restore the building to pre-test conditions