Lightweight materials used in the manufacture of electronic products often give designers the dilemma of either having to restrict the applications or to increase the strength of the enclosure walls. Heat can cause build-up of pressure within an enclosure and without adequate venting the lightweight materials could fracture. Immersion breathers can minimise any damaging effects. These devices allow an enclosure to "breathe" (transfer air in and out) but will withstand driving rain or even total immersion in water up to five metres. Immersion breathers can be made from a range of robust hard wearing plastics and metals. The breathers can pass high flow rates of air which can result from rapid variations in pressure, caused by rapid temperature or altitude changes. The filtration levels offered by immersion breathers also ensures a good level of cleanliness.
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