The U Values for the E12 steel door have been calculated to EN 673, EN ISO 10077-1 and EN ISO 10077-2. As standard, all E12 doorsets have an insulated core.
A standard 45mm E12 with foam core is 2.1 W/(m²K)
The rest of the range is between 2.1 W/(m²K) and 5.1 W/(m²K). Please contact us for more details.