351 The inside of the exhaust air duct is to be classified in the same zone as the inside of the safety storage cabinet. Defining the zones for avoiding ignition sources in accordance with TRGS 723 Area classification for flammable liquids – storage in a safety storage cabinet (DGUV-standard 113-001, collection of examples 2.2.8) NO AREA CLASSIFICATION Case A: the LEL (lower explosion limit) is sufficiently below the flashpoint as the flashpoint of the flammable liquid is sufficiently above the storage temperature (refer to TRGS 721 point 3.2 (3)) OR Case B: the flashpoint is not sufficiently above the storage temperature (refer to TRGS 721 point 3.2 (3)) Technical ventilation is available and the following conditions are fulfilled: • container securely closed, regularly checked for leakage • sealed containers only (no filling or decanting, no sampling) • dried containers, no external flammable liquid residue Protective measures: Case A: in accordance with TRGS 722, point 2.3.2 Case B: in accordance with TRGS 722, point 2.4.4.3 Case A and B: in accordance with TRGS 724, none Area classification ZONE 2 inside the cabinet No area classification outside the cabinet the flashpoint is not sufficiently above the storage temperature (refer to TRGS 721, point 3.2 (3)) Case C: technical ventilation iis available, the conditions for area classification (Case B) are not fulfilled in all points, containers are however tightly closed OR Case D: natural ventilation is available and the following conditions are fulfilled: • container securely closed, regularly checked for leakage • sealed containers only (no filling or decanting, no sampling) • dried containers, no external flammable liquid residue Protective measures: Case C: in accordance with TRGS 722, point 2.4.4.3 Case D: in accordance with TRGS 722, point 2.4.4.2 Case C and D: in accordance with TRGS 724, none Area classification ZONE 1 inside the cabinet Area classification ZONE 2 outside the cabinet the flashpoint is not sufficiently above the storage temperature (refer to TRGS 721, point 3.2 (3)) Case E: natural ventilation is available, the conditions for area classification (Case D) are not fulfilled in all points, containers are however tightly closed Protective measures: Case E: in accordance with TRGS 722, point 2.4.4.2 Case E: in accordance with TRGS 724, none Please observe local legislation and regulations.
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