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TM 38-260
(7)  Example load. The following tabulation is an example of the elements of the estimated dehumidification
load for a 182 by 1,447 foot warehouse of average height on an average July day in the Eastern United States. The
majority of the load in the following example is carried into the warehouse through the entry of outside air, and all but 5.0
percent of this subject to control. The infiltration load can be lowered by improving the sealing of the building, and the
open-door time might be reduced. Emphasis must be placed on adequate surveillance of building sealing and the
establishment and enforcement of local regulations that will keep open door time to humidity controlled areas at a
minimum (see fig 5-1).
CHART 5-1
POUNDS PER DAY
GALLONS PER
PERCENT
LOAD
MOISTURE
DAY MOISTURE
LOAD
Breathing
150
18
5. 0
Door opening (1 door for
1 hr/day
1,000
120
33. 3
Infiltration
940
113
31. 3
(Inventory turn-over)
150
18
5. 0
New Equipment
Concrete floor (untreated)
630
75
21. 0
Transmission
Walls (treated)
60
7
2. 0
Roof (untreated)
70
8
2. 4
TOTAL
3,000
359
100. 0
NOTE: ONE GALLON OF WATER WEIGHS 8. 35 POUNDS
c.  In most instances, the average manufacturing building cannot be adequately sealed for the purpose of controlling
relative humidity. It is impossible to stop the breathing of a warehouse, because of the nature of the structure and
because it would not resist the pressure generated by temperature and barometric changes. When equipment stored in
such buildings must be maintained under relative humidity controlled conditions, it may be necessary to erect a controlled
humidity structure or apply heat to the manufacturing area.
5-8

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