Door System Built for Efficiency


A new steel door system from Assa Abloy (New Haven, CT) is built to meet strict regulations regarding air leakage in commercial buildings.

The Mercury Door System, marketed under Assa Abloy’s Ceco Door and Curries brands, features a new Freon-free polyurethane foam formulation that the manufacturer says is more sustainable than previous options. The system pairs the Mercury steel door with the Mercury Thermal Break frame.

The Mercury door comprises a steel-reinforced polyurethane foam core, covered by 18 to 14 gauge cold-rolled or zinc-coated steel door face sheets, according to Assa Abloy. A single door can be sized up to 4 feet by 9 feet; the maximum size of the Mercury frame, though, is 8 feet by 8 feet.

Efficiency Ratings

Product data states that the door system has both air infiltration and exfiltration ratings of 0.10 cfm/square foot. In terms of thermal emittance, the company says the Mercury system has a U-factor of 0.37, and exhibits an R-value of 2.70.

According to Assa Abloy, the Mercury door system meets or exceeds the following requirements:

  • LEED v4 Building Design and Construction, for low-emitting materials and indoor air quality;
  • GREENGUARD Gold Certification;
  • NFRC thermal standard and air performance guidelines;
  • ASHRAE ceiling and wall systems; and
  • GreenCircle certified for energy savings

The manufacturer suggests using the Mercury system in educational, government, healthcare and worship buildings. The system is fire-rated up to three hours vis a vis UL10C and/or UL10B standards, the company says.

More information:


Tagged categories: Building envelope; Building Envelope; Doors; Energy efficiency; North America; Thermal emittance

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