4FR Series
4FR Series – Proven Protection, Code-Compliance Guaranteed
When safety and compliance are critical, the FM Approved 4FR Series hazardous material storage buildings provide unmatched protection and peace of mind. Featuring a UL-approved 4-hour bi-directional fire-rated wall system, these units are specifically engineered for high-risk locations—perfect for areas less than 5ft from other buildings or tight property lines.
Designed to meet or exceed local building codes, 4FR Series storage buildings combine robust durability with code-compliant design, ensuring your operation stays secure and ready for inspection.
Construction
Exterior Wall Construction
Weatherproof, bi-directional 4-hour fire rated non-combustible construction, per Underwriter Laboratories (“UL”) Fire Resistance Rating Design Number U490, with two (2) layers of ¾’’ UL Classified Ultracode fire-resistive gypsum wallboard fastened to the interior & exterior sides of load-bearing steel studs. Mineral wool batts, nominally 3’’ thick, minimum 4pcf, friction fit between the studs. The interior & exterior surfaces clad with corrosion resistant galvannealed steel sheets for maximum durability, weather resistance & rigidity.
Sump Wall Construction
Weatherproof 4-hour fire-rated non-combustible construction, utilizing interior & exterior continuously welded heavy gauge steel sheets for maximum spill containment protection.
Roof/Ceiling Construction
Weatherproof one hour fire resistive ceiling membrane construction, same as exterior walls, utilizing interior galvannealed steel sheets & continuously welded heavy gauge steel roof sheets for maximum durability and weather resistance. Roof/ceiling permanently attached to exterior walls.
Explosion Relief Construction
The FRE Model includes explosion vent panels, compliant with NFPA 68, and meets the 215 PSF Damage-Limiting design requirements for FM Approval.
Standard Features
All Safety Storage FS and FSE Series Fire Rated buildings are free-standing, relocatable chemical storage and containment structure.
Safety Storage FS and FSE Series Fire Rated structures are designed to meet critical storage, dispensing, or process applications. Each structure includes the following components for storage of flammable or combustible liquids and other hazardous materials.
Factory Mutual System (FM)
Approved & Labeled.
Three-hour fire-rated double door(s)
60”W x 80”H, UL Classified & Labeled, equipped with UL Listed self-closer(s) and UL Listed exterior security lock(s) with keyless interior safety release lever(s).
Screened Air Vent(s)
Air inlet vent(s) equipped with UL Classified & Labeled 3-hour rated fire dampers with louvers & screens to provide air flow. Dampers have a galvanized steel frame, curtain-type galvanized steel blades, and a UL Listed 165°F fusible link.
Building Base
Open channel construction for forklift and/or crane slings and under building inspections.
Internal Spill Containment Capacity
Minimum 30% of total storage capacity. Surpasses regulatory and Factory Mutual requirements for spill containment.
Interior Finish
High solids, chemical-resistant epoxy primer with a white aliphatic polyurethane topcoat.
Exterior Finish
High solids, chemical-resistant epoxy primer with a heat reflective white aliphatic polyurethane topcoat.
Hold-down Brackets (4)
Structural steel angles for bolting to purchaser’s foundation for seismic and wind load anchoring.
Static Grounding System
One (1) exterior grounding connection, one (1) 10-foot long 5/8” diameter copper-clad steel grounding rod, one (1) #6AWG copper conductor, and grounding lug(s).
Signage
D.O.T. hazard classification placard with rust-proof aluminum holder & stainless steel clips; and pressure sensitive NFPA 704 Hazard Rating Sign(s).
UL Classified & Labeled
Base Undercoat – Asphaltic-based, tack-free, flexible base undercoating for superior rust and corrosion protection.
Warranty
15-year structural and 1-Year warranty on option and finish.
Standard Dimensions
Safety Storage hazardous material storage buildings are available in a variety of standard sizes to meet your storage capacity requirements. Our standard sizes are listed below.
Actual Height
104” – 120” (Over Height Options Available)
Exterior Nominal Width
6’, 8’, 10’, 12’, 14’, 16’
Exterior Nominal Length
8’ – 52’ (2’ Increments)