Harden Architectural Security

Maximum Security Louvers

Ventilation Coupled With Combined Threat Resistance

Tested to Department of State Standard SD-STD-01.01 Rev. G (Amended) and UL 752 Level 8, Harden Maximum Security Louvers offer the utmost in DOS certified ballistic and forced-entry resistance while providing essential ventilation for mechanical equipment used to support building operations. Certified to withstand a simulated “mob” attack for 60 minutes and 5.56 M193, 5.56 M855 and 7.62 M80 ballistic rounds, these louvers are designed to provide the ultimate in protection. Insect screening to impede pest infiltration is provided as standard.

Design Overview

ANTI-TERRORISM LEVEL SECURITY where conformance to U.S. Department of State forced-entry / ballistic resistant threat levels is required

DESIGN FLEXIBILITY numerous cladding and trim options offer the ability to complement other building materials

DURABILITY structural steel materials and high-quality finishes provide extreme durability and low maintenance throughout the life cycle

The uniqueness of Harden Maximum Security Louvers can be seen in their simple, efficient design. Structural steel “T” frames combine with chevron-style inserts to create a system that is effective in both shedding rain and deflecting bullets. Widely accepted as the basis of design on many projects, the louvers have been utilized in a wide variety of applications.

Factory welded to simplify installation in the field, modules are constructed in sizes up to 4′ x 10′ (1.22 m x 3.05 m). Louvers can be ganged together to create an even larger louver wall.

  • Government
  • Military
  • Oil & Gas
  • Critical Infrastructure
  • Commercial

  • Perimeter frame with steel louver insert
  • Pre-drilled and tapped sub-frame in one of three styles
    • embed plate with studs for newly poured concrete walls
    • tubing with chemical or mechanical anchors for existing masonry walls
    • tubing for welding to steel walls
  • Stainless steel pest screen on interior
Standard Finish
  • Hot dip galvanized per ASTM A123

Optional Finishes
  • Epoxy primer
  • Manufacturer’s standard finish coat, contact Harden for color chart

Applicable Standards, Testing and Certifications
  • Department of State, SD-STD-01.01 Rev. G (Amended): Certification Standard – Forced Entry and Ballistic Resistance of Structural Systems
  • UL 752, UL Standard for Safety for Bullet-Resisting Equipment
  • AMCA Standard 500: Laboratory Methods of Testing Louvers for Rating
  • Contact Harden for pressure drop and free area velocity performance data
Installation Considerations
  • Louvers are fully assembled at the factory, and require only minimal preparation prior to installation
  • Sub-frames can be shipped in advance of louver assembly
  • Three different methods of installation are available depending on the stage and type of wall construction:
    • Pre-drilled and tapped plate-type embeds cast into concrete
    • Pre-drilled and tapped steel tube-type sub-frames bolted into the wall
    • Pre-drilled and tapped steel tube-type sub-frames welded to the wall structure
  • Louvers can be ganged together to create a large louver wall

Regular inspection of louver and flashing is recommended.

Availability & Cost

Louver systems are typically manufactured to order and subject to production lead times at the time of purchase. Contact Harden for details.


Harden warrants that its Architectural Security products shall remain free of defects in material and workmanship under normal use for a period determined by the individual project specification.

Most products and installations shown in the photos were completed under the previous ownership structure of Ross Technology Company. Building photos courtesy BL Harbert International or US Department of State. Harden maintains ownership rights of all product photos taken at Ross. For details on ownership of specific photos, please contact Harden Architectural Security Products directly.