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FireFlex Dual: When Do You Need Clean Agent and Preaction in One System?

FireFlex Dual is the right choice when a hazard needs both clean agent suppression and automatic sprinkler backup. It combines a clean agent fire extinguishing system with a preaction sprinkler system in a single integrated cabinet, giving customers two layers of protection for water-sensitive but high-consequence spaces.

According to the FireFlex Knowledge Vault, FireFlex Dual systems integrate all components necessary for both extinguishing systems in one factory-assembled cabinet. Available configurations include single interlock and double interlock preaction arrangements, in both self-contained and remote-controlled versions.

Why Combine Clean Agent and Sprinklers?

Clean agent systems are excellent for protecting equipment because they discharge quickly and leave no residue. However, some facilities also want automatic sprinkler backup if the fire continues, grows, or re-ignites.

That is where FireFlex Dual fits. It is designed for spaces such as:

  • Data centers
  • Telecom rooms
  • Control rooms
  • Museums
  • Other high-value or sensitive hazards

The FireFlex website notes that clean agent systems are specifically intended to protect water-sensitive contents, while the Dual system provides an integrated solution for dual-agent applications.

How the Combined Sequence Works

The FireFlex Knowledge Vault provides a clear explanation of sequence of operation.

In general:

  1. The clean agent side is typically initiated by cross-zoned smoke detection.
  2. A pre-discharge timer begins once detection conditions are met.
  3. When the timer expires, FK-5-1-12 clean agent is released.
  4. The preaction sprinkler side then depends on whether the system is single interlock or double interlock.

For single interlock, piping fills with water after detection, but water discharges only if sprinkler heads open.

For double interlock, both detection and loss of system air pressure from sprinkler operation must occur before water enters the sprinkler piping.

This matters because it reduces the chance of unwanted water release while still providing sprinkler backup when needed.

Available Configurations

Based on FireFlex documentation, FireFlex Dual is available as:

  • Single interlock, self-contained
  • Single interlock, remote controlled
  • Double interlock, self-contained
  • Double interlock, remote controlled

The Knowledge Vault also notes construction options such as remote-controlled versions and seismic construction options.

Key Technical Features

FireFlex documentation highlights several practical features:

  • Factory programmed and tested systems
  • FM Approved engineered systems
  • cULus listed engineered systems
  • Compact floor-saving layout
  • Unique serial number on every unit
  • User-friendly owner’s manual
  • Removable locked front doors
  • Optional seismic construction
  • Simplified operation and maintenance

The clean agent used is documented as FK-5-1-12, with typical design concentrations in the 4% to 6% range, not exceeding 10%.

Installation Considerations

The Knowledge Vault includes cabinet dimensions for various cabinet sizes and piping installation details for both preaction and clean agent sides. That is a reminder that Dual systems need space planning for:

  • Cabinet footprint
  • Clean agent piping
  • Sprinkler piping
  • Drainage
  • Electrical supervision and release circuits

One useful optional feature described in the Knowledge Vault is the riser shut-off valve with sight glass. This can allow a full-flow trip test without flooding the sprinkler piping.

When FireFlex Dual Is the Better Choice

Choose Dual when:

  • The hazard is sensitive to water
  • Early clean agent knockdown is desired
  • Code, owner standards, or risk tolerance call for sprinkler backup
  • You want integrated factory assembly instead of separate systems

For example, a telecom room may need a clean agent discharge to suppress fire before it damages electronics, but the owner may also insist on sprinkler backup in case the fire persists.

Next Steps

If the hazard only needs clean agent protection, compare this system with FireFlex 1230. If the owner wants dual-layer suppression in one packaged arrangement, FireFlex Dual deserves serious consideration early in design.

Frequently Asked Questions

Is FireFlex Dual the same as FireFlex 1230?
No. FireFlex 1230 is a clean agent system only. FireFlex Dual combines clean agent with preaction sprinkler protection.

What interlock options are available?
Single interlock and double interlock.

Can FireFlex Dual be remote controlled?
Yes. FireFlex documentation includes remote-controlled options.

Does the clean agent leave residue?
No. The system uses FK-5-1-12 clean agent, which is residue-free.