Controller [ PCB ] for 110V DC BLDC Railway Carraige Fan of 400 mm sweep, confirming to RDSO Specification No. RDSO/ PE/ SPEC/ TL/ 0021- 2005 [ Rev- 3 ] with amendment no 1. Note: Any approved supplier of BLDC fan Firm shall be ensured, that the PCB shall be suitable for all makes of BLDC Fan which are listed in approved vendor directories