The U Values for the BR20 steel door have been calculated to EN 673, EN ISO 10077-1 and EN ISO 10077-2. As standard, all BR20 doorsets have an insulated core.
A standard 45mm BR20 with Rockwool core is 5.4 W/(m²K)
The rest of the range is between 5.4 W/(m²K) and 5.8 W/(m²K). Please contact us for more details.