Polar Cap 2

Polar Cap 2The patented Subzero Engineering Polar Cap 2 is the first fully NFPA compliant containment roof system that attaches to the top of the racks and forms a ceiling that prevents hot and cold air from mixing.

Most data center containment systems rely on the heat generated from a fire related incident to release the containment system, as it can pose an obstacle to the fire suppression agent. The NFPA has determined that it is important to have a faster response time and more importantly, a testable system.

The Subzero Polar Cap 2 retractable roof system is a fully electric roof system that retracts into a metal housing when the fire suppression system is alarmed. Having a pre-action system that reacts to a smoke detector will ensure that the containment roof is fully retracted long before the fire suppression system is discharged. Additionally, the roof material is made with the highest fire resistant standard of ASTM E-84 Class A rating.

The Polar Cap 2 can also be opened and closed when maintenance is required above the containment space. The Polar Cap 2 roof system is 5 feet wide and can be made up to 30 feet long. The aluminum profile is less than 6" high and thus it presents no problem with obstructions above the cabinets.



Property: Material: Result:
Tensile Strength Aluminum 22,000 psi


Modular Design ASTM E84 Class A
Patented NFPA 75 Compliant


60" Width 30' Max Length

Fire/Electrical System Interface

(The electrical line, power supply, and fire panel connections are not provided by us.)


  • 110/220VAC, 5A/2.5A, 50/60Hz Single Phase Supply*
  • *We recommend connecting to a dedicated branch emergency backed up power supply circuit to insure that the Polar Cap 2 will operate during a facility power outage.


  • We recommend the fire protection contractor makes this connection
  • Polar Cap 2 provides a two-wire 24VDC signal that should be wired to customer’s fire alarm control panel (FACP) normally open (N.O.) contact rated at 24VDC, .25A. Upon closure of the FACP N.O. contact, the Polar Cap 2 will automatically open to expose the server aisle to the fire extinguishing agent. Connection to a FACP “pre-act” contact will insure that the roof is fully open prior to the extinguishing agent discharge.

30 Mil Polypropylene


Property: Test: Result:
Spread ASTM E84 10
Smoke Dev. ASTM E84 160


2.5" Pleat
High Light Transfer Matte Finish
Light Transmittance - 85%

PDFPolar Cap 2 Technical Specification Sheet


  • Modular Design
  • Retracting Cover
  • Stock Sizes
  • Custom Sizes
  • Install Kit

Contact your local Data Clean account manager for more information.

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