We provide quantitative fit testing services for chemical masks and workers requiring respiratory protection within their work areas. We also monitors the heat stress condition during the summer months and recommends appropriate work-rest cycles. Note: QNFT hours are Tuesday, 7:40 a.m. to 3 p.m. Walk-in service is only provided for deploying personnel. IAW AFI 48-137, chemical mask quantitative fit test (QNFT) is only required once per lifetime, upon arrival at the first permanent duty station or upon assignment to a unit type code. A fit test will be re-accomplished if a new size or type mask is issued, the wearer gains and losses of 10 percent or more body weight following completion of the initial fit test, or the wearer experiences extensive dental work, facial surgery, scarring, or disfigurement.