If a flammable cabinet is vented, is it okay to open the supply bung and draw air from the room or do both the exhaust an supply have to be ducted to an outside source?
I have been under the impression that NFPA 30 requires both supply and exhaust be ducted to an outside source or the cabinet not vented at all. Leaving the supply bung open in the room even with a spark arrestor seems odd to me.
IUB Laboratory Safety Manager
Environmental Health and Safety
Bloomington, IN 47405
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