Blast & Gastight Hatch SU-III-INW (Inward Opening): Heavy-Duty Protection for Civil Defence Shelters and Secure Facilities

Modern shelters and protected facilities require access solutions that remain operational even under extreme conditions. A standard access hatch cannot provide the level of protection required during blast events, hazardous material incidents, or CBRN emergencies. The Blast & Gastight Hatch SU-III-INW (Inward Opening) is engineered specifically for civil defence shelters, bunkers, military facilities, industrial plants, and other critical infrastructure where safety and structural integrity are essential.

Designed for high blast resistance, gas-tight sealing, and long-term reliability, the SU-III-INW hatch provides secure access while helping maintain the protective envelope of the shelter during emergency situations. It combines robust steel construction with a multi-point locking system, making it suitable for both new construction and retrofit projects.

Engineered for High Blast Protection

The SU-III-INW hatch has been developed to withstand blast pressures up to 440 kPa (4.4 bar), making it suitable for modern civil defence shelters designed to fulfill CEE technical standards.

Its reinforced steel leaf is manufactured using heavy-duty structural beams and steel cover plates that efficiently transfer blast loads into the surrounding reinforced concrete structure.

This design helps maintain structural integrity while protecting occupants and equipment located inside the shelter.

Reliable Gastight Protection

During chemical accidents, toxic gas releases, industrial emergencies or CBRN incidents, maintaining an airtight shelter perimeter becomes essential.

The SU-III-INW hatch incorporates a high-quality rubber sealing system that creates a reliable gastight barrier around the opening.

When installed correctly as part of a protected facility, the hatch helps prevent hazardous gases, smoke and contaminated air from entering the shelter while supporting positive pressure created by CBRN filtration systems.

Inward Opening Design

Unlike conventional shelter hatches, the SU-III-INW is designed for inward opening, allowing installation where project layouts or operational requirements demand this configuration.

The inward-opening design is particularly useful in certain shelter layouts where external obstacles, terrain conditions or engineering constraints influence the preferred opening direction.

The hatch is available for both right-hand and left-hand configurations depending on project requirements.

Heavy-Duty Multi-Point Locking Mechanism

Security and pressure resistance depend not only on the strength of the steel leaf but also on the locking system.

The SU-III-INW features a multi-point locking mechanism with heavy-duty locking bolts that evenly distribute pressure across the frame.

Benefits include:

• Improved resistance to blast loads

• Reliable gastight compression

• Smooth operation

• Long service life

• Secure locking under emergency conditions

The robust mechanism is engineered for repeated operation while requiring minimal maintenance.

Optional Ballistic and Fire Protection

For facilities exposed to elevated security risks, the hatch can be upgraded with additional protective features.

Optional configurations include:

• Ballistic armour plates

• Splinter protection

• Fire-resistant materials

• Forced-entry resistance

These upgrades allow engineers to configure the hatch according to the specific threat profile of military facilities, government buildings, industrial plants or critical infrastructure.

Flexible Installation Options

The SU-III-INW has been designed for maximum installation flexibility.

It supports:

• Installation during reinforced concrete casting

• Retrofit installation in existing shelters

• Right or left opening configurations

• Integration into new civil defence projects

• Shelter modernization programs

This flexibility makes the hatch suitable for both new construction and upgrading older protective structures.

Typical Applications

The SU-III-INW Blast & Gastight Hatch is suitable for a wide range of protected facilities, including:

• Civil defence shelters

• Underground bunkers

• Military shelters

• Safe rooms

• Government facilities

• Command centers

• Industrial protection shelters

• Energy infrastructure

• Data centers

• Emergency operations centers

• Utility protection rooms

Its heavy-duty construction makes it appropriate wherever reliable blast and gastight protection is required.

Technical Specifications

Feature	Specification
Product	Blast & Gastight Hatch SU-III-INW
Opening Direction	Inward Opening
Blast Resistance	440 kPa (4.4 bar)
Gastight	Yes
Locking System	Multi-point locking with locking bolts
Construction	Reinforced steel beams with steel cover plates
Installation	Concrete casting or retrofit
Opening Configuration	Right or Left
Ballistic Protection	Optional
Splinter Protection	Optional
Fire Protection	Optional upgrade

Specifications may vary depending on the selected project configuration.

Key Advantages

✔ Blast resistant up to 4.4 bar (440 kPa)

✔ Reliable gastight sealing

✔ Heavy-duty reinforced steel construction

✔ Multi-point locking mechanism

✔ Optional ballistic protection

✔ Optional splinter protection

✔ Retrofit or new construction installation

✔ Suitable for civil defence shelters

✔ Designed for long operational life

✔ Low maintenance requirements

Why Choose the SU-III-INW Hatch?

Protective structures are only as strong as their weakest opening. The SU-III-INW Blast & Gastight Hatch provides an engineered solution that combines blast resistance, airtight performance and structural durability within one integrated product. Whether installed in a new civil defence shelter or used to modernize an existing bunker, it delivers dependable protection against blast effects and hazardous airborne contaminants while offering flexible installation options for demanding engineering projects.