Trio-E Door Now 3-Hour Fire Rated /Other/Ceco/Images/524x224/Trio-E%20Header-524x224.jpg Ceco Door is pleased to announce that Trio-E doors are now fire rated by Underwriters Laboratories (UL) up to 3 hours. Trio-E 3-Hour Fire Rated Doors Maximum Sizes· 4’ 0” x 8’ 0” singles· 8’ 0” x 8’ 0” pairs (astragal required for 3 hour rating) Trio-E delivers superior insulated values and strength. It also provides aesthetic qualities desired in today’s commercial building applications. Trio-E received a U-Factor of 0.36 in operable condition (ASTM C1363) using a Ceco Door weather-stripped frame and Pemko thermally broken threshold. The Trio-E door is the first hollow metal door to be certified to the UL ISR 102 Environment Standard, attaining the silver level. Architects can enhance a project's energy conservation and support LEED certification by specifying Trio-E thermal entrances 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. For retrofit situations, we suggest adding the Trio-E door along with Pemko S773 perimeter seals.