Abstract: A device to measure local clothing ventilation was developed based on ongoing research. This method chose N2 as the tracer gas and used the so called ‘steady state method’ based on the mass conservation law. This measuring system can measure the clothing local ventilation values of the chest, the back, the right arm and the left arm at the same time. The clothing whole ventilation value can also be computed according to the measured data. The forced ventilation method was used to validate the system and the method was proved to achieve a better feasibility. Local ventilation of several upper body garments (common jacket, knit jacket, shooting jacket and firefighter uniform) were measured using this system. Results confirmed that the method had widespread applicability.

Key words: clothing local ventilation, clothing whole ventilation, tracer gas, forced ventilation, steady state method