Figure 5-3. Indoor Metal Hutment

TM 38-260

Figure 5-3. Indoor Metal Hutment

a. Indoor plastic film dehumidified structures.

(1) A dehumidified plastic film structure is a semi-permanent type indoor hutment that can be purchased

commercially or built with a polyethylene cover over a pipe framework. Polyethylene is prone to tearing at lower

thickness (at or below 0. 006 (6 mil)), but seams will not seal well at higher thickness (above 0. 006 (6 mil)).

Commercially available cocoons or humidity control structures are potentially more durable but may be substantially more

expensive. These factors should be taken into consideration when making the decision to erect a humidity controlled

structure. Either type of hutment provides a satisfactory water vapor barrier to the surrounding atmosphere, controlling

the relative humidity by dynamic dehumidification. This type of structure is adaptable for erection inside of existing

buildings over consolidated or in-place equipment. Overhead obstructions, interfering conveyor systems, piping, and

electrical connections may have to be removed to allow for the installation of a humidity controlled structure.

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