FRD IV

FRD IV heavy-duty steel doors are designed for interior and exterior applications in industrial, commercial and specialist buildings. Their modular construction allows fire-rated, acoustic, security and ballistic performance to be combined according to the operational requirements of each project. The robust door system delivers high mechanical resistance, long service life and extensive options for hardware, accessories and finishes.

Choose door type

Non-fire-rated

Heavy-duty FRD IV steel doors for applications where certified fire resistance is not required. Suitable for interior and exterior use with flexible hardware, accessories and finishes.
Acoustic

FRD IV acoustic steel doors reduce sound transmission in industrial, technical and commercial buildings. Robust construction, perimeter seals and suitable threshold details provide sound reduction of up to 42 dB.
Ballistic-resistant

FRD IV ballistic-resistant steel doors protect personnel and critical assets in high-risk facilities. Reinforced construction is available in FB3 and FB4 classes with specialist locks, panic exit hardware and optional glazing.

Fire-rated

FRD IV fire-rated steel doors for demanding interior and exterior applications. Robust construction provides reliable fire and smoke compartmentation with glazing and specialist hardware available as options.
Security

FRD IV RC3 security steel doors protect openings with elevated resistance-to-burglary requirements. Reinforced construction can be combined with project-specific hardware, panic exit functions and glazing.

Fire resistance

Smoke tightness

Ballistic resistance

Security class

Thermal transmittance

1.7 W/m²K

Cyclicality

Description

Standard equipment

lock
profile cylinder
heavy-duty SHS door hinges
two-piece sealed frame

Frame types

insert frame
wrap-around frame
corner frame

Configuration options

thermally insulated (up to U = 1.7 W/m²K)
with ventilation grille
with glazing
weather louvres
ATEX zones 0-2
X-ray shielding insert

Optional accessories

door hardware
door closer
panic lock
panic exit hardware
electric strike
electromechanical or motorised lock
automatic drop seal, sealed threshold, floor brush or rubber blade
heavy-duty SHS HD door hinge
magnetic contacts for door status monitoring
hold-open magnets
stainless steel kick plate
ventilation grille - not available for acoustic configurations

Finishes

galvanised steel sheet
powder coating in a RAL colour
stainless steel version AISI 304 (1.4301), AISI 316 (1.4404)

Selected parameters

Technical list Contact us

years of experience in technical door solutions

125,000+

manufactured and installed doors

different types of resistance in one solution

We will advise you on selection and design.

Together, we will review your requirements and propose a suitable solution within our production capabilities. We are ready to consult technical details, certifications, and applications for your specific operation.