Various sizes:133mm ~310mm, including : 133x61, 175x62, 175x68, 175x69,190x68, 200x80, 220x63, 225x99, 280x105, 280x135, 310x120, 310x150mm Voltage : 12V, 24V, 28V and 48 VDC Application : Communications Cabinets, Network Cabinets, Central Air-Conditioning Systems, Ventilation Systems and HVAC etc Certifications:UL,CE Canton or pallet