The U Values for the UL15 steel door have been calculated to EN 673, EN ISO 10077-1 and EN ISO 10077-2. As standard, all UL15 doorsets have an insulated core.
A standard 45mm UL15 with foam core is 2.5 W/(m²K)
The rest of the range is between 2.5 W/(m²K) and 3.8 W/(m²K). Please contact us for more details.