HEAT AND MOISTURE EXCHANGE DEVICES

摘要

A heat and moisture exchanger has an element 4 formed by a strip of bacterial filter material that is folded laterally into pleats and bent into a loop so that the folds 41 and 42 extend radially. The element 4 is sealed around its outer edge into a circular casing 1 having axial, tapered ports 2 and 3 at opposite end. A conical gas diverter 46 and 47 is sealed into a central opening of the element 4 on each side. Exhaled gas warms and moistens the element 4; inhaled gas is filtered and takes up some of the heat and moisture from the element. The exchanger is symmetrical so that it can be used either way around.