Editing Gas mask (section)

== Use ==
[[File:Monmouth Regimental Museum - QRpedia 5.JPG|thumb|A 1939 Second World War-era baby's gas mask in [[Monmouth Regimental Museum]]. This design covered the whole of the baby except for its legs.]]
[[File:Aalsmeer_een_medewerker_van_kwekerij_Baardse_met_gasmasker_tegen_het_inademen_v,_Bestanddeelnr_191-0038.jpg|thumb|A worker in a [[plant nursery]] wears a respirator to protect against the insecticides sprayed in the greenhouses, 1930.]]
A modern mask typically is constructed of an elastic polymer in various sizes. It is fitted with various adjustable straps which may be tightened to secure a good fit. Crucially, it is connected to a filter cartridge near the mouth either directly, or via a flexible hose. Some models contain drinking tubes which may be connected to a water bottle. Corrective lens inserts are also available for users who require them.

Masks are typically tested for fit before use. After a mask is fitted, it is often tested by various challenge agents. [[Isoamyl acetate]], a synthetic banana flavourant, and [[camphor]] are often used as innocuous challenge agents. In the military, [[teargas]]es such as [[CN gas|CN]], [[CS gas|CS]], and [[stannic chloride]] in a chamber may be used to give the users confidence in the efficacy of the mask.<ref>{{Cite web |url=http://www.af.mil/shared/media/epubs/AFMAN32-4006.pdf |title=AF M32-4006 - Nuclear, biological, and chemical (nbc) mask fit and liquid hazard simulant training |access-date=July 9, 2010 |archive-url=https://web.archive.org/web/20121020175705/http://www.af.mil/shared/media/epubs/AFMAN32-4006.pdf |archive-date=October 20, 2012 |url-status=dead }}</ref>

{{Further| MOPP (protective gear) | NBC suit}}