FREE Respirator Software from NIOSH

MultiVapor is a computer tool for estimating breakthrough times and service lives of air-purifying respirator cartridges manufactured to remove toxic organic vapors from breathed air. It can also be used for larger filters and for carbon beds of any size prepared for laboratory studies. MultiVapor replaces the program, Breakthrough, which performs the same function for only one organic vapor at all humidities. A breakthrough time is the time following the first and continuous use of a cartridge after which the user of the cartridge could be exposed to a selected concentration of a harmful vapor. This is the consequence of the cartridge being used up. Service life is the breakthrough time with, possibly, a safety factor applied. MultiVapor is intended to help an industrial hygienist or other qualified person to set cartridge change-out schedules. It is not a substitute for regulatory requirements or professional judgments. Users must assume full responsibility for any application of the MultiVapor computer software. No warranties related to the software are expressed or implied by the National Institute for Occupational Safety and Health or its contractors. This software is intended to provide estimates based on the latest scientific information. The accuracies of any such estimates will depend in part on the accuracy and validity of the data entered by the user. Click Here for the software from NIOSH.