There is no way to determine filter life for one work place without significant air quality testing. Every working environment is different regarding airbourne contaminants: hazard risk, exposure levels, and concentrations around the wearer. And the wearers breathing efforts – all impact how long a filter will last. The CleanSpace filters have two advantages to assist filter life i) the filter is located at the back away from the direct path of fumes or dust generated in front of the wearer (i.e. welding, grinding) and ii) the CleanSpace respirators are breath responsive, only pulling air through the filters when the wearer needs it (unlike other PAPRs that have a constant peak flow (>100L/min) which pulls air through the filters regardless of whether the wearer needs the air or not).