DESCRIPTION
In the world of first aid, a “No. 4” kit typically refers to a specific standardized configuration used in industrial, maritime, or military settings. While specific contents can vary slightly by manufacturer or regional safety board (like OSHA or the UK’s HSE), it is generally classified as a Large/High-Capacity Industrial Kit.
Here is the typical description and breakdown of what you would find in a No. 4 kit.
General Overview
A No. 4 kit is designed for large workplaces (often 50+ people) or high-risk environments like construction sites, factories, and large vessels. It is housed in a heavy-duty, usually wall-mountable, dust-proof, and water-resistant case.
Key Features
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Capacity: Specifically scaled to treat multiple injuries simultaneously before emergency services arrive.
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Durability: Usually comes in a “Type III” or “Type IV” container—meaning it is impact-resistant and designed for rugged environments.
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Compliance: Often meets ANSI/ISEA Z308.1-2021 Class B standards or local occupational health equivalents.
Common Uses
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Manufacturing Plants: For dealing with lacerations or crush injuries.
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Commercial Shipping: Often part of the “Scale” requirements for maritime vessels.
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Large Offices: To serve as a central first aid station for a full floor or building.







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