CURRIES CURRIES 777 Door Series Trio – The Natural Door Choice 
Strong, Beautiful, and Green best describe Trio, the innovative new product from CURRIES. Trio is a fusion of composite and steel stiffened core to create a new patent pending laminated core design like no other. Trio contains all of the aesthetic and insulating benefits of a CURRIES Polyurethane door but with the added strength of a steel stiffened door. StrongSteel stiffened laminated core for added strength and durability 30% less thermal bow than most polyurethane foam core doors. BeautifulNo weld marks on the exterior face of doors so aesthetically pleasing finishes can be used. Many different door designs available. GreenInjected polyurethane foam for superior insulation and energy efficiency. Recycled steel content for LEED MR 4.1 and 4.2 credit. Polyurethane foam is CFC and HCFC free. OptionsMaximum door size 4'0" × 8'0" – single Cold rolled or galvanneal Core: Injected polyurethane foam or fiberglass insulation between the stiffeners. PerformanceThermal Insulation: Calculated core values U-Factor 0.09, R-Value 11.0 (ASTM C518), for test data regarding ASTM C1363 and ASTM E283, please refer to our website under Energy Efficiency. 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 hours 4'0" × 8'0" singles and 8'0" pairs (no astragal required!) (UL10C) UL & WH agencies. Energy Efficient SolutionsWhat do the U and R value ratings mean? U-Factor: Overall coefficient of heat transmission through a built-up panel section measured in BTU's per hour per square foot of area for a difference in temperature per degree Fahrenheit between the air on one side to the air on the other side (BTU's/hr-ft 2°F). The lower the U-Factor, the better the insulation. R-Value: Thermal resistance is a measure of ability to retard heat flow. R is an expression of the total resistance to heat flow through a complete panel section or construction assembly. R-Value represents a value of the thermal resistance in hours – square foot – degrees Fahrenheit per BTU of a typical panel section. R-Value is the numerical reciprocal of the U-Value. The higher the R-Value, the higher the insulating value. Similar to most other building products manufacturers, the Steel Door Institute has encouraged the practice of citing a calculated value for thermal performance of the cores in the doors (U and R Values). While this remains the industry standard, we are seeing more specs with the latest standards for thermal transmittance (ASTM C1363) and air infiltration (ASTM E283). Note, ASTM C1363 is the most current test standard for thermal transmittance and replaces ASTM C236. You will see significant differences between the calculated core values (ASTM C518) and the operable door assembly values as door and frame construction varies. Design professionals are beginning to see these variances in other building products such as wall partitions (an industry that has already begun to move from calculated to operable values). We believe it's important you and your customers understand the operable performance levels of the opening assemblies you purchase along with the calculated core values. Door U-Factor and R-Value Ratings
Air Infiltration Testing What is air infiltration? 
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