See below from NFPA 30-2012
“188.8.131.52 If a storage cabinet is not ventilated, the vent openings shall be sealed with the bungs supplied with the cabinet or with bungs specified by the cabinet manufacturer.”
The use of both bung holes IF ventilation is used is only implied by this passage. However, since flammable cabinets are a closed environment except for these holes, little air will circulate through a single open bung hole which is not actively ventilated.
Very Truly Yours,
Dr. Bob Haugen
Director of Product and Technology Development
Flow Sciences Inc.
2025 Mercantile Drive
Leland, NC 28451
Phone 910 332 4878
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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