Energy Efficient Steel Stiffened Door (Trio-E)

With energy prices continually increasing and commercial buildings consuming almost 40% of energy usage in North America, Ceco Door remains committed to providing maximum thermal resistant solutions.The new Trio-E door is steel stiffened for strength, but has achieved an operable U Factor of 0.29 which is 50% better than other steel stiffened doors currently available on the market today. The U-Factor of 0.29 was achieved in an operable condition (ASTM1363) using the Ceco Thermal Break Frame and Pemko 273x3AFG Thermal Barrier Saddle. The Trio-E will provide years of strength and sustainable energy savings for any building.Many building owners spend millions of dollars a year on energy bills and the Trio-E represents a chance for them to realize significant savings on a new or retrofit project.


  • Steel stiffened core for added strength and durability
  • Hurricane rated up to +/- 100 psf 3’0” x 7’0” single


  • No vertical weld marks on door face sheets so aesthetically pleasing gloss paint can be applied
  • Many door designs and color options available


  • Lowest operable U-Factor in the industry for a steel stiffened door (U Factor .29)
  • First swinging door to be certified to the new UL Environment UL ISR 102 standard


Thermal Performance

Thermal Insulation: U-Factor 0.29, R-Value 3.4 (ASTM C1363), For test data regarding ASTM C518 and ASTM E 283, please click here.
Standard Features:

  • 18 gage face sheets, 16 gage optional
  • 16 gage inverted end channels welded to both face sheets for added strength.
  • 14 gage closer reinforcement

Available Sizes:

  • 4’0” x 8’0” maximum single, 8’0” x 8’0” maximum pair


  • Cold rolled or galvanneal steel


  • 22 gage steel stiffeners spaced every 6” apart with injected polyurethane foam

Edge Construction:

  • Mechanically interlocked, hemmed vertical edge seams
  • Seamless edges available

Hardware Reinforcements:

  • Reinforcing formost lock preps, including concealed hardware
  • 7 gage steel hinge reinforcements


  • Electrostatically applied prime base coat
  • Optional Colorstyle factory pre-finish


  • Physical endurance testing: Meets ANSI A250.4 performance test, level A (1,000,000 cycles) class 1 stiffness
  • Fire rating: Up to and including 3 hour  4’0”x 8’0” singles  and 8'0" x 8'0" pairs (UL10C) UL & 90 min 4'0" x 8'0" singles WH agencies.

Winner of the 2013 Award for Design Excellence

Read the press release here for more details.