Civil Engineering Reference
In-Depth Information
Table 10 Estimated in
ltration rates (ACH) for small buildings
Part B. Design inltration rates (ACH) for winter: indoors 68
°
F (20
°
C); wind speed = 15 mph (6.7 m/s)
Construction type
Winter outdoor design temperature
°
F:50
40
30
20
10
0
−
10
−
20
−
30
−
40
°
C:10
4
−
1
−
7
−
12
−
18
−
23
−
29
−
34
−
40
Tight
0.41
0.43
0.45
0.47
0.49
0.51
0.53
0.55
0.57
0.59
Medium
0.69
0.73
0.77
0.81
0.85
0.89
0.93
0.97
1.00
1.05
Loose
1.11
1.15
1.20
1.23
1.27
1.30
1.35
1.40
1.43
1.47
Part C. Design inltration rates (ACH) for summer: indoors 75
°
F (24
°
C); wind speed = 7.5 mph (3.4 m/s)
Construction type
Summer outdoor design temperature
°
F:85
90
95
100
105
110
°
C:29
32
35
38
41
43
Tight
0.33
0.34
0.35
0.36
0.37
0.38
Medium
0.46
0.48
0.50
0.52
0.54
0.56
Loose
0.68
0.70
0.72
0.74
0.76
0.78
Part D. Inltration rates per unit oor area
Ceiling
height
Air
ow
Air changes per hour
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
L/s m
2
2.3 m
0.20
0.25
0.31
0.41
0.46
0.51
0.56
0.66
0.71
0.76
0.81
0.91
0.97
1.02
1.07
1.17
1.22
1.27
L/s m
2
2.4 m
0.20
0.25
0.36
0.41
0.46
0.56
0.61
0.66
0.76
0.81
0.86
0.97
1.02
1.07
1.17
1.22
1.32
1.37
L/s m
2
2.6 m
0.20
0.31
0.36
0.46
0.51
0.56
0.66
0.71
0.81
0.86
0.91
1.02
1.07
1.17
1.22
1.32
1.37
1.42
L/s m
2
2.7 m
0.25
0.31
0.41
0.46
0.56
0.61
0.71
0.76
0.86
0.91
1.02
1.07
1.17
1.22
1.32
1.37
1.47
1.52
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