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NOTE: This is an unformatted excerpt from our online fire protection training library.

Classification Basics

Classification Terminology

Zone 2

Zone 2 areas are similar to Division 2 areas. Zone 2 areas are those locations where ignitable mixtures of gases or vapors are not likely to be present under normal conditions but where accidents, leaks, or some failure or other abnormal condition may release ignitable materials. Areas may be classified as Zone 2 where adequate ventilation adequate ventilation
Adequate ventilation is generally defined as 6 air changes per hour, but in some cases lesser air exchange rates are recognized as adequate. normally prevents an ignitable mixture ignitable mixture
Adequate ventilation will keep a gas or vapor from mixing with air in sufficient quantity to be ignitable. from forming, but such a mixture could form if the ventilation system were to fail. Abnormal conditions may include the failure of a ventilation system where the system is relied on to keep an ignitable mixture from forming. The areas immediately adjacent to most Zone1 areas are Zone 2 areas.

The area around the entire tank and around the Zone 1 areas are Zone 2 areas.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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