Respiratory protective devices are used to protect workers from inhalation of hazardous atmospheres. Beside the aspects related to adequacy of the device in protecting the worker, it is necessary to investigate also the aspects related to the suitability of the device such as ergonomic factors: one of the most common complain of the workers is related to the face thermal sensation perceived as hot.Introduction
In this study, the effect of a power assisted filtering device incorporating a full face mask on the thermophysiological response of a thermal manikin is investigated.Methods
The experimental protocol schedules tests on a standing sweating thermal manikin (Newton) in the climatic chamber, where hot conditions were simulated (air temperature at 34°C, relative humidity at 32%). Two conditions were tested: manikin with the respirator powered on (CR) and manikin without the respirator (CC). Two different levels of metabolic rate were set (1 MET and 3 METs).Results
At M=1 MET and M=3 MET the effect of the hot environment is weakened by the action of the respirator which allows a continuous heat exchange removing and renovating the air layer around the face without providing an additional thermal load.