Thermal Transmission

Thermal Transmission and Air Infiltration

Door openings are integral to the building envelope. As such, they should be designed as effective barriers to thermal transmission, air infiltration and energy loss. ASSA ABLOY’s Trio-E, energy efficient door opening solution, comprises a (steel-stiffened, insulated) hollow metal door, a (thermally-broken) frame and threshold; and, (latching/hanging/closing) hardware that when combined, achieve an operable U-value of 0.29, one of the best ratings in the industry.