Laboratories that are not Laboratories

I must get a dozen questions a year about what NFPA 45 Fire Protection for Laboratories covers. In section 1.1.3 NFPA 45 notes that it does not cover the following:

(1)* Laboratories for which the following conditions apply:

(a) Laboratory units that contain less than or equal to 4 L (1 gal) of flammable or combustible liquid

(b) Laboratory units that contain less than 2.2 standard m3 (75 scf) of flammable gas, not including piped-in low-pressure utility gas installed in accordance with NFPA 54