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Table 4
Average air changes per 24 hours for storage rooms
above 32ºF. (0ºC.) due to door openings and inltration.
Air Air Air
Volume Changes Volume Changes Volume Changes
Cu. Ft. Per 24hrs. Cu. Ft. Per 24hrs. Cu. Ft. Per 24hrs.
200 44.0 2,000 12.0 25,000 3.0
250 38.0 3,000 9.5 30,000 2.7
300 34.5 4,000 8.2 40,000 2.3
400 29.5 5,000 7.2 50,000 2.0
500 26.0 6,000 6.5 75,000 1.6
600 23.0 8,000 5.5 100,000 1.4
800 20.0 10,000 4.9 150,000 1.2
1,000 17.5 15,000 3.9 200,000 1.1
1,500 14.0 20,000 3.5 300,000 1.0
Air Air Air
Volume Changes Volume Changes Volume Changes
Cu. Ft. Per 24hrs. Cu. Ft. Per 24hrs. Cu. Ft. Per 24hrs.
200 33.5 2,000 9.3 25,000 2.3
250 29.0 3,000 7.4 30,000 2.1
300 26.2 4,000 6.3 40,000 1.8
400 22.5 5,000 5.6 50,000 1.6
500 20.0 6,000 5.0 75,000 1.3
600 18.0 8,000 4.3 100,000 1.1
800 15.3 10,000 3.8 150,000 1.0
1,000 13.5 15,000 3.0 200,000 0.9
1,500 11.0 20,000 2.6 300,000 0.85
Table 5
Average air changes per 24 hours for storage rooms
below 32ºF. (0ºC.) due to door openings and inltration.
ºF. ºC. 70 80 70 80 50 60 50 60 50 60 50 60
55 12.8 – – – – 1.12 1.34 1.41 1.66 1.72 2.01 2.06 2.44
50 10.0 – – – – 1.32 1.54 1.62 1.87 1.93 2.22 2.28 2.65
45 7.2 – – – – 1.50 1.73 1.80 2.06 2.12 2.42 2.47 2.85
40 4.4 – – – – 1.69 1.92 2.00 2.26 2.31 2.62 2.67 3.65
35 1.7 – – 0.36 0.41 1.86 2.09 2.17 2.43 2.49 2.79 2.85 3.24
30 -1.1 0.24 0.29 0.58 0.66 2.00 2.24 2.26 2.53 2.64 2.94 2.95 3.35
25 -3.9 0.41 0.45 0.75 0.83 2.09 2.42 2.44 2.71 2.79 3.16 3.14 3.54
20 -6.7 0.56 0.61 0.91 0.99 2.27 2.61 2.62 2.90 2.97 3.35 3.33 3.73
15 -9.4 0.71 0.75 1.06 1.14 2.45 2.74 2.80 3.07 3.16 3.54 3.51 3.92
10 -12.2 0.85 0.89 1.19 1.27 2.57 2.87 2.93 3.20 3.29 3.66 3.64 4.04
5 -15.0 0.98 1.03 1.34 1.42 2.76 3.07 3.12 3.40 3.48 3.87 3.84 4.27
0 -17.8 1.12 1.17 1.48 1.56 2.92 3.23 3.28 3.56 3.64 4.03 4.01 4.43
-5 -20.6 1.23 1.28 1.59 1.67 3.04 3.36 3.41 3.69 3.78 4.18 4.15 4.57
-10 -23.3 1.35 1.41 1.73 1.81 3.19 3.49 3.56 3.85 3.93 4.33 4.31 4.74
-15 -26.1 1.50 1.53 1.85 1.92 3.29 3.60 3.67 3.96 4.05 4.46 4.42 4.86
-20 -28.9 1.63 1.68 2.01 2.00 3.49 3.72 3.88 4.18 4.27 4.69 4.66 5.10
-25 -31.7 1.77 1.80 2.12 2.21 3.61 3.84 4.00 4.30 4.39 4.80 4.78 5.21
-30 -34.4 1.90 1.95 2.29 2.38 3.86 4.05 4.21 4.51 4.56 5.00 4.90 5.44
Storage Temperature of Outside Air
Room 40ºF. (4.4ºC.) 50ºF. (10ºC.) 85ºF. (29.4ºC.) 90ºF. (32.2ºC.) 95ºF. (35ºC.) 100ºF. (37.8ºC.)
Temp. Relative Humidity of Outside Air, %
Table 6
Heat removed in cooling air storage room conditions
(BTU per Cu. Ft.)
Table 3, 4 & 5 extracted and reprinted by permission from ASHRAE 1972 Handbook of Fundamentals.
Table 6 extracted and reprinted by permission from ASHRAE 1967 Handbook of Fundamentals.
Note: For heavy usage multiply the above values by 2.0
For long storage multiply the above values by 0.6