supply of brushless dc (bldc) swivelling type sensorless railway carriage fanbrushless dc (bldc) swivelling type sensorless railway carriage fan,brushless dc (bldc) swivelling type sensorless railway carriage fan 400 mm sweep 110v dc swivelling type ms stand and ms gumble ring as per is : 6680-1992, & conforming to rdso specification no. rdso/pe/spec/tl/0021-2005 rev.3 with amendment no. 1, the frp blade shall be as per drg. no. rdso/p e/sk/tl/0108-2008 (alt. 1). the guard shall be conforming to drg. no. icf/sk-7-6-158 col-ll alt. g (ms). firm s hall submit prototype approval certificate from icf/rcf, internal test report & warranty certificate along with mat erial. supply from icf/rcf approved vendors (bldc fan) only will be accepted. [ warranty period: 30 months after the date of delivery ]