TA Triumph-Adler CLP 4721 - Manual (Page 177)

Appendix
A-4
Operation Environment
10 to 35 °C (50 to 95 °F), 20-80 % RH (condensation-free)
EMI Countermeasures
VCCI Class B, FCC Class B (U.S.), CE (Europe)
IMPORTANT When IPv6 functions are used, the devices used on the
network (routers, PCs, etc) must support IPv6.