Asking around other chat rooms I’ve come across this. I hope helps others. I'm still not sure what to do about RPE specifically for emergency situations but I guess I'll investigate a one time fit test, and then have a fit check procedure for when it's going to be used. Since I'm not on site it'll need someone trained in Fit Testing to be permenantly on site. I can see a whole can of worms with this... Graham. Have a look at this. http://safetynetwork.3m....standing-the-difference/ Essentially – fit checks are what the user should do every time they put a mask on and periodically throughout the day when that mask has to be removed or adjusted. Think that a disposable and half/full masks have a recommended continuous wear period of 1 hour before they need to be removed and/or readjusted. The type of mask – valved or unvalved will determine how the user conducts their check – either a positive or negative pressurisation of the mask will allow them to assess the fit. The method is usually identified in the instructions accompanying the mask. There’s a really useful Fit Test v Fit check poster in the above link too. The fit check is simply good practice. It is not a substitute for a fit test, whether this be by the quantitative method using a Portacount particle counter or qualitative method where you put your RPE wearing colleagues ‘head-in-a-bag’ and sprayed bitrex or saccharin solutions in their face to see if they can taste it. Mark Elsdon Biological Sciences and UBS Safety Officer