Danger OSHA Sign: Confined Space - Enter By Permit Only (Plastic 7" x 10")

Danger OSHA Sign: Confined Space – Enter By Permit Only

The Danger Confined Space – Enter By Permit Only sign is a compliant safety sign designed to restrict unauthorized entry into confined spaces on construction sites, industrial facilities, and utility work zones. Printed in high-visibility black and red on a horizontal format, it communicates a clear, immediate hazard warning to workers and site visitors. Available in multiple sizes and substrate materials, this sign is suited for contractors, safety managers, and trades professionals who need durable, OSHA-aligned signage for confined space programs. It is offered in formats ranging from lightweight adhesive labels to heavy-duty 40 mil aluminum for permanent installations.

Technical Specifications

Unlike generic printed signs, this sign is available in 3M Engineer Grade substrates — both label and aluminum formats — providing enhanced reflectivity and longevity in demanding outdoor or industrial environments. The 40 mil aluminum option with prepunched holes and rounded corners is built for permanent installation where repeated exposure to weather, chemicals, or physical contact is expected.

Key Features & Benefits

Multiple Substrate Options

Available in six distinct materials — from 3M vinyl and laminated plastic labels to 40 mil aluminum — contractors can select the right substrate for the application, whether temporary labeling or permanent site installation. This flexibility reduces the need to source signage from multiple vendors.

40 Mil Aluminum Construction

The aluminum variant is fabricated from heavy-gauge 40 mil stock and laminated for superior durability, making it resistant to impact, moisture, and UV degradation. Rounded corners reduce snagging and injury risk during handling and installation.

Prepunched Mounting Holes

Aluminum signs come with prepunched holes, allowing direct mounting with screws or nails without requiring additional drilling on site. This speeds up installation and ensures the sign is securely fastened in high-traffic or high-wind environments.

High-Visibility Black and Red Color Scheme

The black and red Danger-header format is immediately recognizable as a serious hazard warning, consistent with OSHA Danger signal word conventions. High contrast improves legibility at a distance, which is critical in low-light or cluttered work environments.

Range of Sizes

With four size options from 3.5" x 5" up to 10" x 14", this sign can be deployed across varied applications — from labeling confined space access panels to posting at entry points on larger structures. Selecting the appropriate size ensures the message is visible at the required viewing distance.

Common Applications

Construction Site Confined Space Entry Points

Posted at manholes, excavations, or enclosed structures requiring a permit-required confined space program, this sign communicates entry restrictions to all site personnel.

Industrial Facility Maintenance Areas

Used in manufacturing plants, refineries, or utilities where tanks, vessels, or ductwork qualify as permit-required confined spaces under site safety protocols.

Utility and Municipal Infrastructure

Suitable for posting at sewer access points, underground vaults, and similar municipal infrastructure where confined space entry is regulated and permit-controlled.

Permanent Facility Signage

The 40 mil aluminum format is appropriate for permanent installation on walls, doors, or fencing adjacent to confined space access points that require long-term, weather-resistant identification.

Compatible Materials

• Steel and metal surfaces (aluminum sign with screws or nails)
• Concrete and masonry walls (aluminum sign with appropriate fasteners)
• Smooth flat surfaces (3M vinyl and laminated plastic labels)
• Wood framing and panels (aluminum sign with nails or screws)
• Plastic enclosures and equipment housings (label formats)