Comair Rotron Viking VK12B7 blower w/tachometer output. 5" square by 1.4" overall, 12VDC @ 1.3A nominal. 33CFM @ 0" H2O / 18CFM @1.2" H2O & 14V. A perfect fan for a pair of 4CX250B's or similar tubes. NOS, $25 ea. *