1A. Housed in noncombustible structure or area75.340(a), and:
    (a)  vented to return7.340(a)(1)(i)
     OR
    (b)  ventilated with intake airand monitored for CO or smoke by an AMS (75.351)75.340(a)(1)(ii);
     OR  
     (c)  vented with intake and monitored for heat and either CO or smoke.
           Sensors shall do all of the following:
          (i)   deenergize the installation
          (ii)  activate a visual & audible alarm
          (iii) activate automatic door closure
                   75.340(a)(1)(iii)
OR

1B. Provided with a fire suppression system installed according to the requirements of 75.1107-3 thru 75.1107-1675.340(a), and either:
    (a)  vented with intake air coursed to return75.340(a)(2)(i)
     OR
     (b)  ventilated with intake and monitored for CO or smoke by an AMS (75.351).75.340(a)(2)(ii)

2A.  Two 2A:10B:C portable fire extinguishers or one having at least twice the minimum capacity at permanent installations.75.1100-2(e)(1)
OR
2B.  One 2A:10B:Cportable fire extinguisher and 240 pounds of rock dust at temporary installations.75.1100-2(e)(2)