Gas CREPITUS ad praesidium, variis methodologiis sunt usus, inter Flameproof (d*), auctus Safety (e), Intrinsic Safety (i*), Pressurized clausura (p), Encapsulation (m), Oleum immersio (o*), Arena-Repleti (q*), “n” Type (nA, nR*, nL*, nZ, nC*), ac Praesidium speciale (s).
De explosione pulveris praesidium, aditus circumdant Salutis intrinsecam (iaD vel ibD), Praesidium clausurae (tD*), Encapsulation Praesidium (mD*), et Pressurized clausurae Praesidium (pD).