supply of railway carriage fan, 110 volts dc, 400 mm sweep, fixed type brushless dc ( bldc ) ( sensorless ) , conforming to rdso s specification no. rdso / pe / spec / tl / 0021 / 2005 ( rev 3 ) with amendment no. 1 with fan guard as per icf drg. no. icf / sk-7-6-158 alt ( g ) col-ii or latest. however, the firms may quote for latest specn. / drawing with amendment if any issued by rdso / icf / rcf.the successful tenderer shall supply spare pcb cards equivalent to 2 percentage of ordered quantity of bldc fans, these spare pcbs shall also have the same warranty period as the new fans. [ warranty period: 30 months after the date of delivery ]